müller lyer illusion

Müller-Lyer illusion

[muhl-er-lahy-er, myoo-ler-, mil-er-; German myl-uhr-lee-uhr]
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.

after Franz-Karl Müller-Lyer (1857–1916), German sociologist, who described the illusion in 1889

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World English Dictionary
Müller-Lyer illusion (ˈmuːləˈlaɪə)
an optical illusion in which a line with inward pointing arrowheads is seen as longer than an equal line with outward pointing arrowheads
[C19: named after Franz Müller-Lyer (1857--1916), German sociologist and psychiatrist]

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