More ideas from Stef
Kanizsa Triangle - A floating white triangle, which does not exist, is seen. The brain has a need to see familiar simple objects and has a tendency to create a "whole" image from individual elements. In this there is no "Drawn" White Triangle.

The Kanizsa triangle is an optical illusion first described by the Italian psychologist Gaetano Kanizsa in In the image above, a white equilateral triangle is perceived, but in fact none is drawn.