Word.ws English Dictionary

Ponzo illusion

Ponzo illusion noun: an optical illusion whereby a horizontal bar looks wider when farther up a picture of railroad tracks than when lower.

ponzo illusion: an optical illusion whereby a horizontal bar looks wider when farther up a picture of railroad...
Image: Tony Philips, National Aeronautics and Space Adm, Public domain, via Wikimedia Commons

Noun

Ponzo illusion (plural Ponzo illusions)

  1. An optical illusion whereby a horizontal bar looks wider when farther up a picture of railroad tracks than when lower.

Forms of Ponzo illusion

pluralPonzo illusions

Origin of Ponzo illusion

First demonstrated by the Italian psychologist Mario Ponzo (1882–1960) in 1911.

Questions about Ponzo illusion

What does Ponzo illusion mean?
Ponzo illusion means an optical illusion whereby a horizontal bar looks wider when farther up a picture of railroad tracks than when lower.
What part of speech is Ponzo illusion?
Ponzo illusion is a noun.
What is the plural of Ponzo illusion?
The plural of Ponzo illusion is Ponzo illusions.

Words near Ponzo illusion in the dictionary

  1. Ponzianis
  2. Ponzied
  3. Ponzies
  4. Ponzis
  5. Ponzo
  6. Ponzo illusion
  7. Ponzo illusions
  8. Ponzos
  9. ponzu
  10. Ponzying
  11. poo

Source and license

Adapted from Wiktionary: Ponzo illusion (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “Ponzo illusion.” Word.ws, https://word.ws/ponzo_illusion. Based on Wiktionary, CC BY-SA 4.0.