GC chair was designed by Kengo Kuma for the project of research centre. The spatial structure and basic design of this lab’s architecture are based on chidori-goshi, a Japanese tradi- tional wooden grid structure. Chidori-goshi is a continuation of joints that combine rectangular timber materials at the inter- section of three directions using a technique of wood jointing. This simple chair is completed by woodworking with the seat made with wood and the backrest created only with one top rail. Although the composition is extremely simple, we were required to give it a function of stacking.