Bullseye Illusion
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Although the white region has the same area as the blue ring, it appears to be larger.
Contributed by: Michael Schreiber (March 2011)
Open content licensed under CC BY-NC-SA
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"Bullseye Illusion"
http://demonstrations.wolfram.com/BullseyeIllusion/
Wolfram Demonstrations Project
Published: March 7 2011