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Titchener Illusion
The orange circles are exactly the same size. This illusion is due to the psychologist Edward Bradford Titchener. If two circles are surrounded by other circles, the one with larger surrounding circles will appear smaller.




"Titchener Illusion" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/TitchenerIllusion/
Contributed by: Michael Schreiber
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