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Titchener Illusion

http://demonstrations.wolfram.com/TitchenerIllusion/ The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily. 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. Contributed by: Michael Schreiber

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