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Contrast Illusion


	How bright are the intersections between the lines? With white circles on them, some appear to have black circles. Remove the circles and some appear to have dark smudges. But in fact all are the same. Try different sizes and contrasts for the strongest effect.


	Contributed by: Jon McLoone

Ehrenstein Contour Illusion (The Wolfram Demonstrations Project)

Hermann Grid Illusion (Wolfram MathWorld)

"Contrast Illusion" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/ContrastIllusion/

Contributed by: Jon McLoone

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