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Zollner illusion

[tsuhl-ner; German tsœl-nuhr]
noun Psychology.
  1. a spatial illusion in which parallel lines intersected by short oblique lines are perceived as converging or diverging.
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Origin of Zollner illusion

1950–55; named after J. K. F. Zöllner, 19th-century German physicist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018