In Japanese architecture, fusuma (襖) are vertical rectangular panels which can slide from side to side to redefine spaces within a room, or act as doors. They typically measure about 90 centimetres (3.0 ft) wide by 180 centimetres (5.9 ft) tall, the same size as a tatami mat, and are two or three centimeters thick. The heights of fusuma have increased in recent years due to an increase in average height of the Japanese population, and a 190 centimetres (6.2 ft) height is now common.