A cubical box, about 2 metres square, with its walls vertical and one open side. The interior surfaces are covered with artificial leaves of various sizes, which stick out in a random manner. An observer looking binocularly into the room from the centre of the open side will see its cubical shape due to stereopsis. However, monocularly the room appears almost flat as the mon-ocular cues to depth perception are almost completely eliminated in this room. The leaf room is used to detect and measure spatial distortions resulting from aniseikonia. It can also be used to demonstrate spatial distortion using meridional size lenses. See aniseikonic lens; depth perception.