Fig. 20 Stimulus demonstrating strong binocular rivalry when left panel is viewed by left eye and right panel is viewed by right eye in the same retinal location. The opposite contrasts in each eye tend to switch at random between perception of the light and dark phases. They also exhibit a lustrous, shimmering quality. Note that there is a disparity between the center pentagons in each eye that may be perceived as a relative depth signal even though the contours are of opposite contrast at all points in the figure.