Feb 6, 2020
1. Kanizsa's Triangle
These spatially separate fragments give the impression of a bright white triangle, defined by a sharp illusory contour, occluding three black circles and a black-outlined triangle.
Kanizsa figurers trigger the percept of an illusory contour by aligning Pac-Man-shaped inducers in the visual field such that the edges form a shape. Though not explicitly part of the image, Kanizsa figures evoke the percept of a shape, defined by a sharp illusory contour.
2. Neon color spreading: the cyan circle's contours are illusory.
3. The Ehrenstein illusion is of a bright disc.
4. A Kanizsa illusion in the lower arms.
