Poggendorff illusion

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English[edit]

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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[edit]

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

Pronunciation[edit]

Noun[edit]

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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