# Poggendorff illusion

> English word · Noun

## Definitions
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.

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/poggendorff-illusion