Saturday, May 28, 2011

Kanizsa triangle

  • The Kanizsa triangle is an optical illusion first described by the Italian psychologist Gaetano Kanizsa in 1955.
  • In the accompanying figure a white equilateral triangle is perceived, but in fact none is drawn. 
  • This effect is known as a subjective or illusory contour. 
  • Also, the nonexistent white triangle appears to be brighter than the surrounding area, but in fact it has the same brightness as the background.

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