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Link to original content: http://en.wiktionary.org/wiki/Poggendorff_illusion
Poggendorff illusion - Wiktionary, the free dictionary Jump to content

Poggendorff illusion

From Wiktionary, the free dictionary

English

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When lines are obscured by the grey rectangle, the blue line appears to be the continuation of the black line; in fact, as shown on the right, this is incorrect.

Etymology

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Named after Johann Christian Poggendorff, journal editor who discovered the effect in figures submitted by Johann Karl Friedrich Zöllner in 1860.

Pronunciation

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Noun

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Poggendorff illusion (plural Poggendorff illusions)

  1. An optical illusion involving the misperception of the position of one segment of a transverse line that has been interrupted by the contour of an intervening structure.
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