| ■Tokyo National Research
Institute for Cultural Properties |
■Center for Conservation
Science |
| ■Department of Art Research,
Archives and Information Systems |
■Japan Center for
International Cooperation in Conservation |
| ■Department of Intangible
Cultural Heritage |
|
Venue: Gunma Music Center, designed by architect Antonin Raymond (1961)
Keynote Speech by Dr. Patricia O’Donnell (Proposal of key issues on “heritage ecosystems”)
Group discussions among different four groups (Group C)
The Tokyo National Research Institute for Cultural Properties (TOBUNKEN) dispatched three staff members to attend the 10th Anniversary International Symposium of the Tomioka Silk Mill and Related Sites, held at the Gunma Music Center in Takasaki from January 10 to 11, 2025. Organized by the Gunma Prefectural Government and ICOMOS Japan, the theme of the symposium was on revisiting the concept of heritage authenticity in commemoration of the 30th anniversary of the adoption of “the Nara Document,” with a focus on the need to adapt it to the increasingly complex social challenges of the 21st century. JCIC-Heritage, managed by TOBUNKEN, also organized a seminar and symposium in November last year to commemorate the 30th anniversary of “the Nara Document.” (For more details, please refer to the web link at the end of this report.)
The symposium program reflected the vision of the principal organizer, Emeritus Prof. KONO Toshiyuki at Kyushu University and former president of ICOMOS. Unlike a conventional symposium format, the program consisted of four group discussions with keynote speeches from guest experts and academics, introducing “heritage ecosystems” as a key concept for discussion. The symposium welcomed approximately 120 participants, including 14 guest experts and academics from 8 countries, and around 80 voluntary experts and academics from 19 countries. The diverse attendance contributed to a distinctly international atmosphere.
Although the concept of “heritage ecosystems” is not yet widely recognized, the symposium interpreted it as encompassing “the cyclical and organic relationships among various elements that constitute the rich cultural and natural environment of the region.” Each keynote speech aimed to reframe the significance of “Tomioka” by connecting it to the living silk industry and sericulture, such as “Preparing the Next Generation for the Silk Industry” by Mr. TSUCHIYA Masashi, Executive Director of Usui Silk Mills Ltd., and “Sericulture in Modern Japan: Silkworm as a Recombinant Protein Factory” by Prof. KUSAKABE Takahiro at Kyushu University, presenting a perspective entirely different from the conventional heritage conservation approach. Every participant actively engaged in open-ended discussions within their respective groups, with the following four key issues on “heritage ecosystems” as presented in the keynote speech by Dr. Patricia O’Donnell, former president of ICOMOS International Scientific Committee on Cultural Landscapes in mind:
1. How does the work you are presenting relate to the heritage ecosystem approach?
2. What opportunities do you see that emerge from working with a system of heritage assets?
3. What benefits to communities and heritage can a heritage ecosystem approach advance?
4. How does the heritage ecosystem approach advance understanding of heritage authenticity?
As a culmination of the keynote speeches and group discussions, the “Gunma Declaration on Heritage Ecosystems” was formally adopted at the conclusion of the symposium.
Together with JCIC-Heritage, TOBUNKEN will continue its efforts to strengthen international cooperation in heritage conservation and gather information on global cultural heritage affairs through active participation in international conferences.
References
The JCIC-Heritage 35th Seminar: 30 years of the Nara Document in the Global Context of Heritage Conservation
https://www.jcic-heritage.jp/news/35seminar_report/
The JCIC-Heritage F.Y.2024 Symposium: Restoration of Notre Dame de Paris and Philosophy of Monuments Conservation
https://www.jcic-heritage.jp/news/2024syoposium_report/
Cathedral of Santa Maria del Fiore
Statues kept inside the cupola
Since 2021, The Japan Center for International Cooperation in Conservation has been involved in a research survey on stucco decoration and clay statues under the research project “Technology for the Conservation and Restoration of Cultural Heritage” program.
From January 13 to January 18, 2025, we visited Florence to conduct preliminary research on a group of sculptures created by Pietro Francavilla and Giovanni Battista Caccini, Mannerist sculptors of the late Renaissance, and to discuss future research plans with the Opera del Duomo Museum, which holds the collection. These sculptures represent the principal saints of Florence and were created in 1589 to celebrate the wedding of Grand Duke Ferdinand I de’ Medici of Tuscany and Christine of Lorraine. The purpose was to decorate a temporary façade, which was installed on the front of the Cathedral of Santa Maria del Fiore for the one-day celebration. For this reason, the technique of sculpture in plaster was chosen, rather than the marble that was commonly used at the time.
Currently, these sculptures are stored in a room inside the cathedral cupola, but they have deteriorated over time, and research on their structure and the materials used has not progressed sufficiently. In cooperation with the local National Restoration Institute and the Fine Arts Superintendence, we are working to deepen the investigation and promote research that will contribute to future conservation and restoration efforts.
The terraces in front of the Central Complex (Cruciform Terrace is highlighted in red)
Excavation at the Cruciform Terrace
Conservation of the Central Tower's original stone members
Ta Nei Temple is a Bundist temple estimated to have been built during the period from the end of the 12th to early 13th century. A large rectangular terrace and a Cruciform Terrace are aligned at the eastern side of the Central Complex, which is the front side of the Temple. While a large terrace is often set in front of the building complex in the other temples of the same period, the style connecting a cruciform terrace in front of a rectangular terrace is unique. Therefore, these are considered important remains, when we think about the characteristics of Ta Nei Temple. However, as tree roots had grown on the terraces and the soil infill layer inside the terraces had unevenly subsided, the terraces had largely collapsed, especially the Cruciform Terrace.
Therefore, the Japan Center for International Cooperation in Conservation dispatched four staff members from the end of November to late December 2024 and started an excavation of the Cruciform Terrace as a preliminary investigation for future discussion on the conservation and restoration methods, working with the archeological staff of the Authority for the Protection and Management of Angkor and the Region of Siem Reap (APSARA) of the Cambodian government. At the same time, surveys on internal structures, damage, and remaining status of fallen stone materials were conducted and fundamental discussions related to the direction of future restoration were held.
As a result of the excavation, many scattered stone materials that could be considered to have formed the Cruciform Terrace were detected under the accumulated soil around the Terrace. Furthermore, some parts of the foundation work layer and the internal structure of the Terrace were revealed. When we investigated the current level of the Terrace foundation, some subsidence was observed toward the ends of southern and northern wings, but the foundation itself remained in relatively good condition. On the contrary, it was confirmed that the side walls and floor materials were lost in many areas and that, as a result, an inner infill mainly consisting of sand had flowed out at the southern and northern sides of the eastern wing and around the southern wing of the Terrace. Almost no materials that can be estimated to have been used for the middle layer of the side walls of the Terrace were found, which could suggest that these stone materials were taken away intentionally during some past era(s). Based on these observations, we discussed the restoration methods of the Cruciform Terrace with APSARA staffs and mostly agreed on a basic direction and future plan for the restoration.
Simultaneously, we conducted some additional conservation work of stone materials at the eastern and western entrances of the Central Tower. Partial restoration of these areas had been ongoing until August 2024 (Field Activities Parts XVI to XVII). In addition, during the mission, meetings of the International Coordinating Committee (ICC-Angkor/Sambor Prei Kuk) were held in Siem Reap City from December 11 to 13. We reported on the completion of restoration of the entranceway of the Central Tower and the investigation on the Cruciform Terrace in front of the Central Complex.
Landscape of the Al-Khokha area
The treatment of mural painting fragments
The Japan Center for International Cooperation in Cultural Heritage is conducting a joint research project on the conservation and restoration of mural paintings in a rock-cut tomb located in the Al-Khokha area on the west bank of Luxor. This project is being carried out in cooperation with the Waseda University Institute of Egyptology and the Egyptian Ministry of Antiquities. The wall paintings under study were discovered in 2013 by Professor Emeritus Jiro Kondo in the tomb of Khonsuemheb and are estimated to date back to around 1200 BCE, during the New Kingdom period.
This mural painting is painted on a wall made of mud plaster applied to the surface of limestone. Previous research had focused on developing methods for cleaning surface dirt and identifying suitable restoration materials and techniques for areas where the plaster has detached or fallen off. In our field research conducted from November 20 to December 5, 2024, we examined methods for reattaching wall painting fragments discovered during excavation to their original positions. As a result, we achieved positive outcomes regarding the reinforcement of the wall substrate and protection of the painting’s surface. Furthermore, we were able to confirm certain successes in the reinstallation process, using materials similar to the original ones, such as mud and clay, to return the fragments to their original locations. Moving forward, we will continue to monitor the effectiveness and stability of the treatments applied and observe their long-term outcomes.
This research has been carefully advanced through a process that involved foundational studies, a series of experiments, and the development of treatment methods with practical considerations in mind. The results are unprecedented in Luxor and have been highly praised by the Egyptian Ministry of Antiquities and local experts. Moving forward, we will continue to promote research that contributes to the conservation and restoration of the numerous wall paintings created during the New Kingdom period, aiming for further achievements in this field.
Workshop “Conservation of Historic Settlement in Kirtipur”
Historic house in Khokana settlement totally collapsed due to damage brought by heavy rain the previous summer
Aiming for the conservation of a historic house that faces the historic square in Old Kirtipur, a joint survey between Kirtipur Municipality and Tokyo National Research Institute for Cultural Properties (TOBUNKEN) has been underway since 2023. During the dispatch of one staff member from TOBUNKEN from December 20 to 27, 2024, a workshop titled “Conservation of Historic Settlement in Kirtipur” was co-organized by the municipality and TOBUNKEN and held on December 26 to promote a common understanding for the preservation and utilization of the target house.
The workshop consisted of two sessions. In the morning session, a lecture regarding the “good practices of the preservation and utilization of a historic house in Nepal” was presented by staff from Kathmandu Valley Preservation Trust (KVPT), and the results of a survey of the target house were reported by the TOBUNKEN staff member and Nepalese experts of the research team. More than 50 participants attended the workshop, including the Kirtipur mayor, deputy mayor, ward chairperson, and the house owners and their family members. Both, local government and house owners’ sides expressed positive opinions towards the preservation and utilization of the house. In the afternoon session, 16 members from the owners’ family joined a brainstorming session to discuss various topics regarding their house, such as memories, emotions, the future surrounding the building, where they have spent long periods of their lifetimes over many generations, past and presents.
Although there is still long way to go before concluding the decisions on the actual implementation of the preservation, the workshop brought an opportunity to share the value of the historic house through dialogue, and seemed to push the related stakeholders to move one step forward to its preservation.
Additionally, a quick survey on the historic settlement of Khokana, which is on the World heritage tentative list, was also made during this mission. While most of the historic houses in the settlement were rebuilt after the Gorkha earthquake in 2015, a few historic houses remained in the central area that are said to have been built in 19th century. We had been consulted by locals regarding their preservation; however, unfortunately, one of the historic houses had collapsed during the previous September due to damage brought by heavy rain. Although it was a consolation that no-one was injured in the collapse, it is regrettable that such a valuable building, which had watched over Khokana for more than 100 years, was lost forever, and necessary support was not able to reach them when they were in need.
The opening ceremony of the Scientific Symposium, featuring distinguished participants gathered on the stage
A view of the Historic Center of Ouro Preto (a UNESCO World Heritage Site inscribed in 1980)
A representative from the Institute attended the 2024 Annual General Assembly of the International Council on Monuments and Sites (ICOMOS AGA) and its Scientific Symposium, held from November 13 to 15, 2024, in Ouro Preto, Brazil. Founded in 1965 following the adoption of the 1964 International Charter on the Conservation and Restoration of Monuments and Sites (the Venice Charter), ICOMOS is an international, independent organization (NGO) composed of experts and academics dedicated to heritage conservation. With over 10,000 members worldwide, ICOMOS serves as an advisory body to UNESCO, renowned for their mission on evaluations of the condition of World Cultural Heritage sites.
This year’s Scientific Symposium, themed “Revisiting the Venice Charter: Critical Perspectives and Contemporary Challenges,” commemorated the 60th anniversary of the Venice Charter’s adoption. The event featured active discussions on the current state and prospects of heritage conservation, centered around four keynote speeches and four roundtable sessions. A key point of the discussions was the acknowledgment that the Venice Charter has become outdated in the 21st century, as heritage conservation increasingly intersects with pressing social issues such as climate change, migration, and inequality. As a result, the Ouro Preto Document was adopted as an outcome of the Symposium, with a strong recommendation for establishment of a new international charter to replace the Venice Charter.
The Tokyo National Research Institute for Cultural Properties will continue to gather and compile information on the safeguarding of cultural heritage overseas and attend international conferences like this in the future as well.
A field study on conservation and restoration
A presentations at an international symposiums
The Japan Center for International Cooperation in Cultural Heritage is conducting a joint research project on the conservation and restoration of mural paintings on the interior walls of St. Michael’s Church (Keşlik Monastery) in Cappadocia, Turkey, in cooperation with a local specialized institutions and universities. Last year, a research plan was prepared based on field surveys, and after deliberations by the Ministry of Culture and Tourism of the Republic of Turkey and an expert committee, the project was officially approved for implementation.
From October 25 to November 9, 2024, we visited the site and conducted on-site research in collaboration with the Nevşehir Conservation and Restoration Research Center. The research focused on strengthening the detached plaster layers and removing soot stains from the surface of the mural paintings, among other conservation and restoration methods. Effective approaches were identified for both, and based on these results, a conservation and restoration plan were developed. Additionally, on November 6, we participated in an international symposium on this project held at Cappadocia University, where we presented a report on the objectives and progress of the project.
This joint research project has grown into an international project led by the Tokyo National Research Institute for Cultural Properties, with participation from specialized institutions and universities in Turkey, as well as experts from Europe. It aims not only at academic research but also at activities that will be useful to many people involved in the conservation and utilization of cultural heritage.
Information leaflet (front)
Scene of the seminar
Since 2018, the Japan Center in Conservation has been hosting the World Heritage Seminar, which aims to transmit information and facilitate exchange of opinions about the world heritage system. In FY 2024 the seminar, titled as “The Soft Edges of World Heritage: Buffer Zone and Wider Setting,” focused on the periphery set up around the property to provide its adequate protection. There were 84 participants, mainly representatives from local governments all over the country at the meeting, held on November 25, 2024, at the Tokyo National Research Institute for Cultural Properties (TOBUNKEN).
After the introduction provided by Mr. KANAI Ken, Head of the Resource and Systems Research Section of the Japan Center for International Cooperation in Conservation, who explained the purpose of the seminar, Mr. SUZUKI Chihei (Agency for Cultural Affairs) made a report under the title of “Trends on World Heritage,” on the discussions held and decisions made at the 46th World Heritage Committee meeting held in New Delhi in July, 2024. Then, Mr. MATSUDA Akira (University of Tokyo) and Mr. MATSUURA Kazunosuke, Associate Fellow of the Japan Center for International Cooperation in Conservation then each gave lectures, titled “The Spread of the Concept of Heritage on the Periphery of World Heritage Sites” and “The Buffer Zone and Wider Setting in Italy: Spread of Heritage Value Based on the Landscape Protection,” respectively. Next, Mr. SATO Yoshihiro (University of Iwate), Mr. KIDO Masayuki (Shiga Prefecture) and Mr. SHODA Michihiko (Fukuoka Prefecture) presented case reports titled, respectively, “The Buffer Zone and Wider Setting in Hiraizumi,” “The Buffer Zone and Wider Setting as Inscription of Hikone Castle on the World Heritage, List” and “The Notion of Wider Setting in HIA: from a Case Study of Munakata-Okinoshima and a Lecture of WHSMF.” Thereafter, all speakers discussed the desirable situation of Outstanding Universal Value, an institutional question in Japan to support the World heritage protection and the future of the World heritage system.
Through these lectures, case reports, and discussion, it was clarified that the wider setting introduced recently by UNESCO, though it is difficult to define, could be approached from both material and immaterial aspects, and recognized by a framework that combines protection and valorization. Moreover, we could reaffirm the huge difficulty in managing the periphery of World heritage sites under the current Japanese legislative system. TOBUNKEN will continue to conduct research on the international heritage protection system, including the theme that emerged from the seminar.
Investigation of flood damage in Barbar temple
Symposium on Al Faw Archaeological Area
The Japan Center for International Cooperation in Conservation sent a research team to Bahrain and Saudi Arabia to take part in investigation and discussion of the preservation of cultural heritage in early October.
A tripartite memorandum of agreement had been signed among the Bahrain Authority for Culture and Antiquities, the Tokyo National Research Institute for Cultural Properties, and the Institute for the Study of Ancient Civilizations and Cultural Resources at Kanazawa University. Together they launched a research center to promote archaeological studies in Bahrain and cultural heritage preservation projects in collaboration. The purpose of this visit was to investigate the current preservation conditions of cultural heritage that had been damaged by heavy rain in the beginning of this year. In Qalat al Bahrain, collapse of the outer walls of the fort by water damage and serious bending of the ceiling beams made from palm trees were recognized, and the site was temporarily closed to the public. Additionally, soil erosion was recognized in a well thought to be the most sacred part of the Barbar temple, and several stones were inclined or moved by the water flow. Effects on the cultural heritage due to increasing annual precipitation is becoming more serious year by year across the Middle East. We proposed to periodically monitor the progression of deterioration in comparison with the past situation, and discussed immediate countermeasures to reduce flood damage.
We attended a symposium held in Riyadh that focused on the Al Faw Archaeological Area in Saudi Arabia, which had just been newly inscribed on the UNESCO World Heritage List in September 2024, and then visited the archaeological site. Excavation has been completed only by a few percentages, as the Al Faw Archaeological site is large and complex, mainly composed of a pre-Islamic caravan city, and also includes an area of ritual practice and numerous mound tombs from the Bronze Age. We also had a meeting with the Heritage Committee of the government of Saudi Arabia, and agreed to continue discussions on a partnership to promote site management and research for a future public opening of the Al-Faw Archaeological Area.
Training in Photogrammetry
Peace Park Tour VR in the Hiroshima Peace Memorial Park
Experiencing AR content at the Ichijodani Asakura Family Site Museum
The Japan Center for International Cooperation in Conservation held a workshop and study tour, titled, “Workshop on 3D Digital Documentation of the Cultural Heritage and Its Application” and “Study Tour on the Utilization of AR, VR, and Digital Contents in Japanese Museums and Archaeological Sites,” in Japan on October 21-30, 2024 as a part of the Activities for Exchanges in International Cooperation for Conservation of Cultural Heritage sponsored by the Agency of Cultural affairs. This is an advanced program following a basic technical workshop held in Bahrain in December 2023. Seven researchers who were invited from five different counties, Bahrain, Kuwait, Saudi Arabia, Oman, and Egypt, attended an advanced technical lecture and hands-on program, and received on-site training in flying unmanned aerial vehicles (UAVs) for wide-area surveys of archaeological sites and historical buildings. Furthermore, a study tour to find examples of usage of 3D digital documentation in Japan was conducted.
The aim of holding this invitational program in Japan is to provide opportunities to learn about various usage and applications in the areas of historical education, museum exhibitions, and open-site museums in addition to implementing 3D digital documentation in the fields of archaeology or historical buildings. The following examples were introduced: digital content, such as a digital chronicle of the Japanese fine arts produced by the Tokyo National Museum and National Center for the Promotion of Cultural Properties; a 3DDB Model Viewer, which is a twin digital project sponsored by the National Institute of Advanced Industrial Science and Technology; and the “Museum of the Street,” which is a unique program to provide touchable exhibitions reproduced from 3D digital data of real museum objects. Moreover, we visited and experienced the “Peace Park Tour VR” at Hiroshima Peace Memorial Park; Otsuka Ohmi Ceramic Co., Ltd., a factory producing replicas of cultural properties; and augmented reality (AR) and virtual reality (VR) contents merged with an on-site exhibition of archaeological remains and reconstructed streetscape in the Ichijodani Asakura Family Site Museum.
Since it was seen that each country has different main objectives to implement 3D digital documentation, more practical cooperation programs to respond to each need will be considered in the future.
Implementation of pack method using inorganic restorative materials
Before and after conservation and restoration
The Tokyo National Research Institute for Cultural Properties has been conducting research titled “International Research on Technology for the Conservation and Restoration of Cultural Heritage” since the fiscal year 2021. Last year, a research survey was conducted on the trowel paintings at the earthen storehouse of the former Kina-Saffron-Shu-Honpo in Nagaoka City, Niigata Prefecture. The research focused on removing contaminants such as dust, as well as identifying appropriate conservation and restoration methods for damaged areas, such as peeling and flaking, with the aim of establishing effective techniques. This research was commissioned by the government of Nagaoka City. Building on this, from 26 September to 16 October of this year, a follow-up study was conducted with the cooperation of European experts. The goal was to develop methods for reinforcing and restoring the colored layers and plaster layers, as well as techniques for retouching the decoration.
In the past, synthetic resin-based materials were used for the repair of damaged areas of these trowel paintings. However, due to the high temperature and humidity in summer and heavy snowfall during the winter, the materials had deteriorated significantly over time. At times, the restoration materials themselves contributed to the deterioration of the trowel paintings. To improve this situation, we considered introducing durable inorganic restoration materials. For the retouching, we adopted a coloring method that not only preserves the dignity of the mural, which will soon be 100 years old, but also harmonizes with the overall appearance of the entire trowel painting storage.
The conservation and restoration methods for the trowel paintings established through this series of research surveys mark the first such case in Japan from the perspective of cultural heritage preservation studies. While it will be necessary to evaluate the effectiveness of the results based on future monitoring, it can be said that a significant step forward has been made toward improving the current condition.
said that a significant step forward has been made toward improving the current condition.
Stucco decoration on the ruins
Survey scene at the archaeological site
Since 2021, The Japan Center for International Cooperation in Conservation has been involved in a research survey on stucco decoration and clay statues under the research project “Technology for the Conservation and Restoration of Cultural Heritage” program.
As part of these activities, we visited the Roman ruins of Somma Vesuviana in Italy on September 6 and 7, 2024. This site, located on the north side of Mount Vesuvius, has been investigated since 2002 by an excavation team led by the University of Tokyo, which has so far discovered remains of buildings thought to have been founded around AD. As a result of various investigations, there is a strong possibility that these buildings were a villa of Augustus, the first emperor of the Roman Empire, as described in historical records.
During this visit, we focused on the stucco decorations that remain among the ruins, conducted preliminary research on the materials, techniques, and coloring used, and prepared a research plan. In this plan, we also mentioned the possibility of deepening our study on modern methods of conservation and restoration of the decorative gateway, where stucco decorations and wall paintings remain, with a view to preserving and utilizing the remains.
We will continue to deepen our understanding of the structure and characteristics of stucco decoration through comparative research on stucco decoration techniques and materials for archaeological sites of the Greek and Roman periods, and continue our research on their conservation and restoration methods and site management.
Visiting Nagoya Castle
Observing paper samples during a lecture on paper basics
The International Course on Conservation of Japanese Paper (JPC) 2024 took place from August 26 to September 13, 2024, co-organized by ICCROM and the Tokyo National Research Institute for Cultural Properties (TOBUNKEN), continuing a tradition we have upheld since 1992. Through this three-week course, participants engaged in a comprehensive study on the methods that have been used to preserve paper cultural properties in Japan. The primary goal of the JPC course is to encourage participants to incorporate Japanese conservation techniques into their conservation efforts worldwide, while understanding the techniques in Japanese contexts. This year, we invited ten specialists from Armenia, Canada, Germany, Italy, Malta, Mexico, The Netherlands, Switzerland, the UK, and the US, selected from 165 applicants across 60 countries.
This JPC course consisted of lectures, practical workshops, and a study tour. During the lectures, the participants explored the protection systems for cultural properties in Japan, the characteristics of Japanese paper, and the traditional tools and materials used in conservation, such as wheat starch paste and Japanese brushes.
For the practical sessions, technical masters from a group, whose techniques called “Restoration Techniques for Mounts” were officially selected as the Selected Conservation Techniques (National), join as lecturers. The participants gained hands-on experience in restoration processes by creating a kansu (handscroll).
The second week featured a study tour to the Chubu (central) and Kinki (southern-central) regions of Japan. Highlights included observing the use of byōbu (folding screens) and fusuma (sliding doors), in a traditional setting at Nagoya Castle. The tour also took the participants to Mino, where they witnessed the papermaking processes of Honminoshi, a technique designated as an Important Intangible Cultural Property of Japan. Additionally, the participants visited a traditional restoration studio in Kyoto that has been operating since the Edo period (1603-1867).
In the final week, the focus shifted back to practical work on the structure and handling of kakejiku (hanging scrolls), folding screens, and handscrolls.
In the post-course questionnaires, many participants expressed that they had gained a deeper understanding of the use of Japanese paper for conservation purposes. We hope that the techniques and knowledge acquired through this JPC course will be disseminated and adapted in the conservation and restoration of cultural properties overseas, and thereby contribute to their enhanced protection.
West entrance of the Central Tower before and after restoration (3D model created by Photogrammetry)
Stone conservation
Located in the northeastern area of the Angkor Monuments, one of the World Heritage Sites in Cambodia, Ta Nei is a Buddhist temple thought to have been built in the late 12th to early 13th century. Its Central Tower, about 15 meters high, is partly collapsed, but still has pediments with carved Buddhist motifs on all sides and a pedestal inside on which the main Buddha image is thought to have been placed.
The entrance frames on each side are made of sandstone, but the upper frames on both the east and west sides are broken and deformed, and they had been supported by wooden supports. During this visit, we carried out partial restoration work on the entrance components to structurally stabilize the east-west entrance of the Central Tower and to remove the wooden supports so that visitors can safely walk along the central axis of the temple while viewing the temple as its original appearance.
Prior to the restoration work, the restoration plan was proposed and approved at the international meeting of ICC-Angkor/Sambor Prei Kuk in March 2024 (see previous article here). Subsequently, the work began in June under the leadership of the Authority for the Protection and Management of Angkor and the Region of Siem Reap (APSARA). As part of its technical cooperation for this restoration project, the Tokyo National Research Institute for Cultural Properties (TOBUNKEN) dispatched two staff members (XVI field survey) from June 15 to July 2, 2024, and one staff member (XVII field survey) from August 7 to 11, 2024, for collaborative work with the APSARA staff. Specifically, the following procedures were followed: (1) dismantling and recording the sand stones composing the entrance and scattered stones in the surrounding area, (2) partial dismantling of the doorframes, (3) stone restoration, (4) reassembling, and (5) recording after restoration, which was successfully completed when the staff was dispatched in August.
Examination of structural members by master carpenters and staff from both Japan and Bhutan
The Lham Pelzom house
Since 2012, the Tokyo National Research Institute for Cultural Properties (TOBUNKEN) has been continuously engaged in research on vernacular houses in Bhutan, in collaboration with the Department of Culture and Dzongkha Development (DCDD), Ministry of Home Affairs, Royal Government of Bhutan. The DCDD promotes a policy of preserving and utilizing vernacular houses by integrating them into the legal protecting framework of cultural heritage, while TOBUNKEN supports the initiative from academic and technical aspects.
The Lham Pelzom house, located in Kabesa near the capital of Thimphu, is considered the oldest among about eighty vernacular houses that we have surveyed across Bhutan. This house is enclosed with rammed-earth outer walls that have few openings. Because it has very different characteristics from the current ordinary houses in Bhutan, we assume that it was built at the latest in the 18th century or earlier.
At the time of our initial survey in 2013, this house was already dilapidated. In 2017, the wooden parts, including the roof and floor of the upstairs, completely collapsed. Coping with this situation, the structural members scattered in the house were collected and stored, and a temporary roof was constructed to preserve the remaining structure of the outer walls. During the COVID-19 pandemic we could not conduct on-site activities, and the Bhutan side continued with the procedures to obtain cultural heritage status designation of this building. As a result of those efforts this house was successfully designated as a cultural heritage site in 2023, the first time for a vernacular house.
We dispatched four people, including two TOBUNKEN staff and two external experts from Japan, from August 12 to 23, 2024. The team surveyed the structural members as part of the restoration planning for this vernacular house with local staff, including DCDD officials. Dr. Alejandro Martinez, Associate Professor of Kyoto Institute of Technology, who had previously taken part in storing the members, worked to identify where each member was originally used. Mr. TOBASE Koji, master carpenter and Chairperson of the Japanese Association for the Conservation of Techniques for Traditional Architecture who experienced many restorations of traditional Japanese wooden buildings, examined each member for its reusability and discussed its restoration methodology. Nine Bhutanese master carpenters who are engaged in restoring historical buildings joined the activities. During the surveys, we were visited by H.E Mr. Tshering, Home Minister of Bhutan, and interviewed by the national TV station and a newspaper. This project attracts strong interest in Bhutan. We are continuing to carefully work on the overall restoration plan, considering the maximum conservation of its authenticity, and to support the tasks including the restoration cost calculation for securing the production budget on the DCDD side.
The surveys were conducted with the support of a JSPS Grant-in-Aid for Scientific Research (B) “Vernacular Stone Masonry Houses of Bhutan: A Study on the Architectural Characteristics and the Suitable Approach for Protection as Cultural Heritage” (Principal Researcher: TOMODA Masahiko).
Stone piece joining experiment
Site visit survey of stone sculpture conservation and restoration
The Japan Center for International Cooperation in Conservation is working with European experts to improve the current situation regarding the conservation and restoration of stone cultural properties in Japan.
From July 1 to 6, 2024, we visited Florence, Italy, and with the Opificio delle Pietre Dure and Italian national conservators of cultural properties, we conducted experimental research on reinforcing stone surfaces and joining stone pieces using restoration materials that are not available in Japan.
We also visited the conservation and restoration site of the stone sculptures installed in the Boboli Gardens, landscaped by the Medici family in the 16th century, to observe and deepen our knowledge on how to deal with various types of damage, such as cracks, delamination, and filling in missing areas. The methods used to control biodeterioration, which tends to occur due to the outdoor environment, are particularly interesting, and the way of thinking is also linked to conservation management. This was a great learning experience, as the methods are expected to be effective in Japan as well.
We have set a goal to continue our research to improve the current situation regarding the conservation and restoration of domestic stone cultural heritage, by continuing experimental studies and case studies, as well as deepening our links with experts in the field.
The Palatine Chapel of the Norman Palace
Stucco Decoration by Giacomo Serpotta (The Oratorio del Santa Cita)
Since 2021, The Japan Center for International Cooperation in Conservation has been involved in a research survey on stucco decoration and clay statues being conducted as part of the research project “Technology for the Conservation and Restoration of Cultural Heritage” program. The original research plan was to begin in a Mediterranean coastal area where stucco as a building material was beginning to be used as a material for decoration and for the production of clay statues. Although the spread of coronavirus infection had forced changes to the research plan, including a switch to a domestic survey, the relaxation of waterfront measures has led to a return to the original plan and activities are now being resumed in Europe.
From July 5 to July 7, 2024, we visited Palermo, Italy, to discuss cooperation with the local Superintendent of Cultural Heritage regarding research on archaeological sites from the period during which the Greek colonial city was built. We also visited the Arab-Norman buildings, including Monreale Cathedral, which has been designated a World Heritage Site thanks to their efforts, and a church with stucco decorations by Giacomo Serpotta, a sculptor who was active mainly in the 16th and 17th centuries, and we briefly investigated the conservation and restoration efforts.
In the future, through research into stucco decoration techniques and materials for archaeological sites in Sicily, we will deepen our understanding of their structure and characteristics, and continue our research into their conservation and restoration methods and site management.
Comprehensive survey to create a list of heritage houses in Old Kirtipur
Located about 4 km southwest of the capital Kathmandu, Kirtipur is listed on the tentative list of World Heritage Sites as a medieval Newari settlement with well-preserved monuments within its core area. However, due to the rapid urbanization and the demolishing and reconstruction of historic houses after the Gorkha earthquake in 2015, the historic townscape of Kirtipur has been drastically changing. A major challenge is that, while public monuments such as Royal Palaces, Temples, and Shrines are protected under the laws in Nepal, there is no effective regulatory framework for protecting historic houses.
To tackle this issue, a joint research project between Kirtipur Municipality and Tokyo National Research Institute for Cultural Properties (TOBUNKEN) on the preservation and utilization of historic houses in Kirtipur was launched in October 2023.
During the dispatch of two staff members of TOBUNKEN from July 16 to July 23, 2024, an additional architectural survey was conducted on a house that had been selected as a pilot case study. In collaboration with engineers of the municipality and other Nepalese experts, a detailed measurement survey, 3D digital documentation, and survey on the traces indicating the building’s transitional history were carried out. In addition, with the cooperation of Dr. Lata Shakya, Project Researcher of Ritsumeikan University, interview surveys were carried out with house owners and a local historian, and a comprehensive survey to create a list of the privately owned historic houses in Kirtipur was also conducted under the direction of Dr. Bijaya Shrestha, an expert on the conservation of historic settlements.
These surveys gradually unveiled history of the house; the target house is assumed to have been used as an administrative office of the ancient Kirtipur Palace and retains significant importance with a well-preserved original façade among the existing historic houses that constitute the townscape of Kirtipur.
The house faces an urgent need of repairs due to termite damage and rainwater leakage. For historic houses facing difficulties regarding various practical factors such as lack of repair budget and ownership issues, clarifying the historic value and promoting wider recognition as a cultural heritage site could be an important step towards the preservation and the conservation.
Through trials and dialogues with relevant people, including house owners, administrative officers, and various experts, we would like to explore ways of safeguarding private historic houses that not only carry on the cultural richness of the town, but also present a link towards its sustainable development.
Work on the pyramid sequence worksheet
Making a puzzle of an ancient Egyptian boat
Tokyo National Research Institute for Cultural Properties has organized the Cultural Heritage Kids Workshop starting from 2023 to promote interest in cultural heritage to the next generation, especially for elementary school children. The second workshop was held on July 27, 2024, and 25 children and their families in total over 70 people attended.
The main theme, “Cultural heritage in Ancient Egypt,” was taken over from the last workshop, but for the second workshop we added new programs: a worksheet for creating a sequence of pyramids, an introduction to excavations in Egypt, and a three-dimensional puzzle of an ancient Egyptian boat. Each program had objectives of enabling the children to understand archaeological chronology, to learn the steps involved from the discovery of an archaeological site to the research and conservation work, and to study the meaning of some ancient Egyptian script and the ingenuity of boat builders. Children could learn about the fundamentals of academic studies on cultural heritage through this workshop.
Holding such workshops not only provides children with the opportunity to increase and renew their interest in mysterious aspects of cultural and historic heritage, but it is also beneficial to the generation of their parents, because we can introduce them to the research and the significance and background of cultural heritage studies. We will continue to hold workshops based on the results of our research and studies that are unique to the research institution.
Main venue, Bharat Mandapam
The Japanese delegation observes deliberation on the Sado Island Gold Mines
The 46th session of the World Heritage Committee was held in New Delhi, India from July 21 to 31, 2024, in which we four members of the Tokyo National Research Institute for Cultural Properties (TOBUNKEN) participated as observers, three from the Japan Center for International Cooperation in Conservation and one from the Department of Art Research, Archives and Information Systems.
The Committee brings together representatives of the State Parties to the World Heritage Convention and advisory bodies to deliberate on new nominations, state of conservation etc., of World Heritage sites. Twenty-four new sites were added to the World Heritage List this time, bringing the total number to 1,223. Regarding the “Sado Island Gold Mines,” widely reported in Japan, ICOMOS had recommended reconsideration of the contents and boundaries of the property and requested additional information from the State Party to facilitate the boundary revision. Subsequently, the handling of correspondence by the Japanese government led this site to an inscription on the List, decided unanimously by the Committee. In the deliberations on the state of conservation, inscription on the List of World Heritage in Danger was avoided the for all four properties previously recommended, including Stonehenge in the UK, due to a planning of highway construction at its boundary. On the other hand, the St. Hilarion Monastery in Palestine, currently at risk of destruction from war, was newly nominated and simultaneously inscribed on the List of World Heritage in Danger.
At side events held during the session, the latest trends related to World Heritage Sites were introduced by various State Parties and organizations. Outside of the plenary session, a series of forums was organized for site managers and young professionals, who held lively discussions on pressing issues such as sustainable heritage management.
Participating in a World Heritage Committee session on-site is a very rare opportunity to learn about the latest international trends, hardly obtainable online. TOBUNKEN will continue to disseminate information, including the content of this event, through such measures as hosting a World Heritage Seminar this November.
