Hering's Illusion

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Hering Illusion

Discovered in the 19^th century by German physiologist Ewald Hering, it's a veritable classic now. Orbison illusion is one of its variants. Wundt illusion produces a similar, but inverted effect.

References

A. Seckel, The Art of Optical Illusions, Carlton Books, 2002 (#122)
The Mind's Eye, Readings from SCIENTIFIC AMERICAN, W. H. Freeman and Company, 1986

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