A figure in which three illusory contours form a triangle is known as a Kanizsa triangle.
Gaetano Kanizsa (1913 – 1993) was an Italian psychologist and artist of Jewish descent and of Slovenian Catholic descent who last served as a founder of the Institute of Psychology of Trieste. Kanizsa became famous in the 70s, after having published an article about illusory contours and the book Organization in Vision (1979).
An optical illusion is an illusion caused by the visual system and characterized by a visual percept that appears to differ from reality.
Richard Gregory proposed a useful orientation for categories. According to him, there are three main classes of optical illusions: physical, physiological, and cognitive illusions, and in each class there are four kinds: Ambiguities, distortions, paradoxes, and fictions.
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