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

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

From MarketWatch • Apr. 9, 2026

Doing something your brain tells you is structurally impossible was like inhabiting an optical illusion and we all laughed as we scaled the multi-tiered falls with the occasional assistance of a tethered rope.

From The Wall Street Journal • Jan. 28, 2026

They had an idea to incorporate a 3D illusion and trompe l’oeil effects into a Kobe mural they were planning, and since optical illusion murals are my specialty they reached out to me.

From Los Angeles Times • Jan. 25, 2025

Is a rat hole the same as an optical illusion deemed to be a holy image?

From Slate • Feb. 11, 2024

I knew the glow was my imag-ination or an optical illusion based on the fact that the light coming from the basement was bright while the rest of the house was so dark.

From "Shelter (Book One): A Mickey Bolitar Novel" by Harlan Coben