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Müller-Lyer illusion

[muhl-er-lahy-er, myoo-ler-, mil-er-; German myl-uhr-lee-uhr]
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noun
  1. a geometric illusion in which two lines of equal length appear unequal depending on whether angular lines forming arrowheads at each end point toward or away from each other.

Origin of Müller-Lyer illusion

after Franz-Karl Müller-Lyer (1857–1916), German sociologist, who described the illusion in 1889
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for muller-lyer illusion

Müller-Lyer illusion

noun
  1. an optical illusion in which a line with inward pointing arrowheads is seen as longer than an equal line with outward pointing arrowheads

Word Origin

C19: named after Franz Müller-Lyer (1857–1916), German sociologist and psychiatrist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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