The Kanizsa triangle is a famous optical illusion that was first described by the Italian psychologist Gaetano Kanizsa in 1955. In this figure we "see" a white equilateral triangle but in fact none is drawn. This effect is known as a subjective or illusory contour. Also the nonexistant white triangle appears to be brighter than the surrounding area. In fact it has the same brightness as the background. An optical illusion is any illusion that deceives the human visual system into perceiving something that is not present or incorrectly perceiving what is present. ... 1955 is a common year starting on Saturday of the Gregorian calendar. ... For alternate meanings, such as the musical instrument, see triangle (disambiguation). ...
Another contour illusion is the Ehrilich illusion (2). Categories: Optical illusions ...
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