News story Motion Induced Blindness - Supplement: well-known visual illusion figures - go back to the News story FIGURE 1: The Necker cube Viewing the figure immediately produces some sort of three-dimensional view of the figure, where it tends to have an orientation in space. After a short period of viewing, the cube suddenly changes its orientation.                                   Figure 2: The Kanizsa Triangle.  Illusory contours are seen forming a triangle-shaped region although there are no corresponding luminance changes. Note also that the illusory figure seems brighter than the background.