“Kawarabei” Traditional artisans in Japan had an eco-aware custom of reusing old roof tiles of various shapes as material for the exterior walls of new houses. These walls show fragments of these roof tiles kneaded into them. INAX’s Sentousai tiles recreate the natural textures of these kawarabei, i.e., plaster (mud) walls. Three types of tiles, all with different thicknesses, make up Sentousai. The lights and shadows produced by these differences in thicknesses are a unique feature of these unusual Sentousai tiles.