Hering Illusion
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The Hering illusion was first discovered by German physiologist Ewald Hering in 1861. It shows how straight lines can appear to be bent in the presence of background lines.
Contributed by: Rob Morris (March 2011)
Based on a program by: Margherita Barile
Open content licensed under CC BY-NC-SA
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"Hering Illusion"
http://demonstrations.wolfram.com/HeringIllusion/
Wolfram Demonstrations Project
Published: March 7 2011