Japan · Stone craft; Masonry; Ryukyuan heritage
グスクの石積み (Gusuku no ishizumi); 相方積み (aikata-zumi)
Gusuku are the walled strongholds and sacred enclosures of the Ryukyu Islands; an estimated 300–400 dot the archipelago. The largest are enclosed by masonry of Ryukyu limestone, a porous coral-reef stone. Wall-building developed in three stages: nozura-zumi (rubble), nuno-zumi (coursed blocks) and aikata-zumi (polygonal blocks fitted like a jigsaw). The Okinawa Prefectural Museum's curator dates precise fitted masonry to the mid-14th to early 15th century, with walls over 10 m high. He notes that fully stone-walled enclosures appeared more than 150 years before stone-walled castles spread in mainland Japan from Azuchi (1576). Uncut rubble walls reach only about 2.5 m; dressing the stones and notching their corners into L-shapes so that upper and lower courses lock together let walls rise past 10 m. In aikata-zumi each stone is carved from its natural shape to interlock with its neighbors, so a wall stays standing if one stone falls and can be repaired piece by piece; an early example is the third enclosure of Nakagusuku, built around 1440 by Gosamaru. The masons also practiced a refined aesthetic that archaeologist 安里進 (Asato Susumu) calls 'the stone beauty of curves, curved surfaces and distortion'. Wall faces are dressed very slightly concave. Corners are rounded and swept up into horned capstones (sumigashira-ishi). Gateways are arched, and the walls flanking them are deliberately asymmetric. Flights of steps are curved in profile so that they look straight from the front. Five gusuku are part of the World Heritage site 'Gusuku Sites and Related Properties of the Kingdom of Ryukyu' (2000). The craft survives in restoration. Current works still re-lay fallen walls in aikata-zumi: they reuse old stones in their original positions, use new Ryukyu limestone only where needed, and mark new stones with lead plates. The number of masons able to build this way is falling.
Risk level: Endangered · Not inscribed as ICH. The walls are part of the World Heritage property 'Gusuku Sites and Related Properties of the Kingdom of Ryukyu' (2000, cultural)
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