Definition of Zöllner illusion in English:

Zöllner illusion

Pronunciation /ˈtsəlnər/ /ˈzôl-/ /ˈzɔlnər ɪˌluʒən/


  • An optical illusion in which long parallel lines appear to diverge or converge when crossed by rows of short oblique lines.

    ‘The Poggendorff illusion was actually derived from another famous illusion - the Zöllner illusion.’
    • ‘It may be that the Zöllner illusion is caused by this impression of depth.’


Late 19th century named after Johann K. F. Zöllner (1834–82), German physicist.