BAIA came into existence in the center of Shibuya the center of Tokyo metropolitan as a cave suddenly appeared in the city. BAIA consists of 5 floors and the design concept of entire floor is “a cave within the city.” We believed only a minimal design could visualize the fascinating and exotic atmosphere of a cave, and kept it minimal using emerald green lighting and mortar which we think suited for this modern cave. The lighting plan of fascinating emerald green lights added a glamor to the space and helped to visualize the design concept “a cave within the city.”