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 91.5 centimetres (3.00 ft) wide by 183 centimetres (6.00 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. In older constructions, they are as small as 170 cm (5'7") high. They consist of a lattice-like wooden understructure covered in cardboard and a layer of paper or cloth on both sides. They typically have a black lacquer border and a round finger catch.