[tsuhl-ner; German tsœl-nuh r]
a spatial illusion in which parallel lines intersected by short oblique lines are perceived as converging or diverging.
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. 2019