411 REFERENCE · Wiktionary
Poggendorff illusion
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
thumb|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
Named after Johann Christian Poggendorff, journal editor who discovered the effect in figures submitted by Johann Karl Friedrich Zöllner in 1860.
Pronunciation
en uːʒən 6
Noun
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.
en eponyms
en Optical illusions