In Japanese architecture, fusuma (襖) are opaque vertical rectangles which can slide from side to side to redefine spaces within a room, or act as doors. They typically measure about 3 feet wide by 6 feet tall, the same size as a tatami mat, and are two or three centimetres thick. The heights of fusuma have increased in recent years due to an increase in average height of the Japanese population, and a 190 cm height is now common.