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Delboeuf Illusion

The red circles have the same radius. However, their sizes seem to vary, depending on the sizes of the blue circles. This illusion was first discovered by Franz Joseph Delbouf, a Belgian philosopher and expert on hypnosis.

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"Delboeuf Illusion" from the Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/DelboeufIllusion/
Contributed by: Michael Schreiber
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