Müller-Lyer illusion
[muhl-er-lahy-er, myoo-ler-, mil-er-; German myl-uh r-lee-uh r]
- 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.
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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
Müller-Lyer illusion
- an optical illusion in which a line with inward pointing arrowheads is seen as longer than an equal line with outward pointing arrowheads
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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
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