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Ehrenstein Contour Illusion
The area between radial lines appears brighter than the background. This apparent discrepancy in brightness produces the illusion of circles or squares in between the radial lines. This contour illusion was found by the German psychologist Walter Ehrenstein in 1941.




"Ehrenstein Contour Illusion" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/EhrensteinContourIllusion/
Contributed by: Michael Schreiber
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