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Kanizsa figure
Kanizsa figure A Kanizsa figure is a visual pattern in which appropriately arranged openings in visible shapes, called inducers, make people perceive the edges and surface of a figure even though those contours are not physically drawn.
A Kanizsa figure is a visual pattern in which appropriately arranged openings in visible shapes, called inducers, make people perceive the edges and surface of a figure even though those contours are not physically drawn. In the example described, four circle segments can create the impression of an illusory rectangle.