# Jastrow illusion

> English word · Noun

## Definitions
1. An optical illusion in which two adjacent identical curved shapes appear to be of different sizes.

## Etymology
Attributed to the Polish-American psychologist Joseph Jastrow.

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