optical illusion

American  

noun

1. illusion4

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optical illusion British  

noun

1. an object causing a false visual impression

2. an instance of deception by such an object

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Etymology

Origin of optical illusion

First recorded in 1785–95

Example Sentences

By presenting Satan's fall as a violent physical event instead of a purely spiritual allegory or optical illusion, Dante may have helped move Western thought toward the idea that celestial objects can directly reshape Earth.

From Science Daily • May 11, 2026

It is actually something of an optical illusion, for the options are not getting more expensive in terms of price as the earnings date approaches, but they are remaining the same price.

From MarketWatch • Apr. 23, 2026

Scotland fans on social media have compared the new away jersey to the optical illusion dress that became an internet sensation in 2015.

From BBC • Mar. 24, 2026

Pilots often experience an optical illusion of a passing object that can make it appear to be traveling at great speed even if it is barely moving, officials have said.

From The Wall Street Journal • Feb. 22, 2026

The hairpin crown was an optical illusion: it’s just hair, graying and cropped short.

From "Cat's Eye" by Margaret Atwood