隠岐石に宿る時間の重み、建築的な美しさ、空間にひとすじの張りをもたらす存在感。kamabocoは、自然素材の力強さと建築的な構造美を内包した家具でありながら、建築物を見るような感覚をもたらすプロダクト。
神が宿る島、島根県隠岐諸島で採石される隠岐片麻岩。2億5,000万年前、日本列島がまだ超大陸の一部だった時代に形成された希少性の高い石。その永い時間の記憶を宿した隠岐石を、椅子という日常のスケールへ落とし込んでいる。
石によって黒系や青緑系の表情を持ち、磨くことで大理石のような白い縞柄が現れる。重厚でありながら、どこか静謐。和の空間にも、モダンなホテル空間にも調和する。
着想源は日本の食文化の一つである蒲鉾。半円形と板という、とてもシンプルな組み合わせ。半円形の座面と、それを支える板状の石材。蒲鉾板が水分を調節し鮮度を保つ役割を担うように、この椅子の構造部材には、建築的な役割が与えられている。ビスや接着剤を使わずに組み上げるための継手には、建築で用いられる「相欠き」が取り入れられている。材を互いに半分ずつ欠き取り、噛み合わせ、隠岐石の座面が持つ自重によって固定。異素材に頼らず、石そのものの質量と構造で成立している点がkamabocoの特徴である。
2億5,000万年前の日本の質量に異素材は必要ない。日本を生み出した記憶がある隠岐石。隠岐片麻岩は今も力強く鼓動を打っている。
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隠岐片麻岩
隠岐片麻岩は、約2億5,000万年前にできた隠岐最古の岩石。日本列島が今のような姿ではなく超大陸の一部だった頃に形成したものであり、どのようにして日本が形成されたのか、現代の私たちに教えてくれる。もともと海底に堆積した砂や泥からなる岩石で、プレートの沈み込みによって地下約15kmの深さに移動し高温度の圧力を受けることで、白黒の縞模様の岩石に変化した。同じ時期に形成された片麻岩は飛騨地方や朝鮮半島にも分布しており、隠岐を含めたこれらの地域はかつて一続きであったと推測できる。典型的な片麻岩は島後の中心部にある銚子ダム周辺の崖で見られ、島前・島後の道路などの砂利として使われていることも多く 隠岐では普遍的な岩石の一つである。島後北東部の葛尾山付近を中心とする半径およそ8 kmのほぼ円形の地域には、隠岐片麻岩類（または隠岐変成岩類）とよばれる変成岩が分布している。隠岐片麻岩類の分布地域には、泥質片麻岩、ミグマタイト質片麻岩、片麻状花崗岩、角閃岩のほか少量の石灰質片麻岩と珪質片麻岩をみることができる。泥質片麻岩とは、もともとは海底にある泥質の堆積物が固まって泥岩となった後、 地下に押し込められて高温の状態となり（隠岐変成岩類ではおよそ摂氏800度）粗粒の結晶からなる変成岩になったもの。この泥質片麻岩は石英や長石類からなる白っぽい部分と 黒雲母が多い黒っぽい部分が縞状になっているのが特徴である。
Credit
Dimensions
H439/W679/D600mm/Weight178kg
Material
隠岐片麻岩/Oki Gneiss
Partner Companies
SOW inc.（原石サプライヤー）
真鶴石材店（石材加工）
中尾謙作（作品撮影）
有限会社朝日砕石（撮影場提供）
寿畜産（撮影場提供）
The weight of time embedded in Oki stone, its architectural beauty, and its presence that brings a subtle sense of tension to a space.kamaboco is a piece of furniture that embodies both the raw power of natural materials and the structural beauty of architecture, while offering an experience akin to encountering a piece of architecture itself.
Oki Gneiss, quarried in the Oki Islands of Shimane Prefecture, an archipelago known as an island where the gods reside.Formed 250 million years ago, when the Japanese archipelago was still part of a supercontinent, it is an exceptionally rare stone.Oki stone, carrying the memory of that immense span of time, is brought down to the everyday scale of a chair.
Depending on the stone, its surface reveals tones ranging from deep black to blue-green, while polishing brings out white veining reminiscent of marble.Solid and weighty, yet somehow serene.It harmonizes effortlessly with both traditional Japanese interiors and contemporary hotel spaces.
The inspiration for kamaboco comes from kamaboko, a traditional Japanese food.A remarkably simple combination of a semicircular form and a wooden board.A semicircular seat supported by a slab of stone.Just as the wooden board beneath kamaboko helps regulate moisture and preserve its freshness, the structural elements of this chair are given an architectural role.The joint that allows the chair to be assembled without screws or adhesives incorporates a traditional architectural technique known as “aikaki.” Each component is cut halfway through, interlocked with the other, and secured by the weight of the Oki stone seat itself.A defining characteristic of kamaboco is that it relies not on additional materials, but on the mass and structural integrity of the stone itself.
No additional materials are needed for the mass of Japan from 250 million years ago.Oki stone carries the memory of the forces that shaped Japan.Oki Gneiss continues to beat with a powerful pulse even today.
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Oki Gneiss
Oki Gneiss is the oldest known rock on the Oki Islands, formed approximately 250 million years ago. It was formed when the Japanese archipelago was not yet in its present form but was still part of a supercontinent, offering clues to how Japan itself was formed.Originally, it consisted of rocks derived from sand and mud deposited on the seafloor. Through the subduction of tectonic plates, these materials were carried to depths of approximately 15 km beneath the Earth's surface, where they were subjected to high temperatures and intense pressure, transforming them into rocks characterized by distinctive black-and-white banding.Gneiss formed during the same period is also found in the Hida region of Japan and on the Korean Peninsula. This suggests that these regions, including the Oki Islands, were once connected as part of a continuous landmass.Typical examples of Oki Gneiss can be seen in the cliffs around Choshi Dam, in the central part of Dōgo Island. It is also frequently used as gravel for roads and other infrastructure throughout the Oki Islands, making it one of the most ubiquitous types of rock found there.In a roughly circular area approximately 8 km in radius centered around Mt. Kuzuo in northeastern Dōgo Island, metamorphic rocks known as the Oki Gneiss Complex, or Oki Metamorphic Rocks, are distributed.Within this area, one can find pelitic gneiss, migmatitic gneiss, gneissic granite, and amphibolite, along with smaller amounts of calcareous gneiss and siliceous gneiss.Pelitic gneiss originated as muddy sediments deposited on the seafloor. After becoming mudstone, these sediments were pushed deep underground and exposed to extremely high temperatures—approximately 800°C in the case of the Oki Metamorphic Rocks—transforming them into metamorphic rock composed of coarse-grained crystals.This pelitic gneiss is characterized by alternating bands of pale-colored areas composed mainly of quartz and feldspar, and darker areas rich in biotite.
