optical illusion

noun

plural optical illusions
: a misleading image presented to the vision
Zebras look like optical illusions to me. Which are they—black with white stripes or white with black stripes?Al Robinson
The sun, moon, and planets circle above the terrestrial plane in the region of the equator. Their apparent rising and setting is an optical illusion caused by atmospheric refraction …Ranger Rick

Examples of optical illusion in a Sentence

The closer building looks larger than the farther one, but it's just an optical illusion. The two buildings are actually the same size.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The 1980s brought an interest in the Necker cube, an optical illusion in which a two-dimensional drawing of a cube is perceived as having three dimensions and two possible spatial orientations. News Desk, Artforum, 24 Apr. 2025 Rewind one year and this reality would seem like an odd attempt at an optical illusion. Megan Feringa, New York Times, 14 Apr. 2025 Horse Walking In Snow Creates Optical Illusion By Soo Kim Life and Trends Reporter Newsweek Is A Trust Project Member news article 0 A video showing an unexpected optical illusion captured in a parking lot in Florida has gone viral on TikTok. Mark Joseph, Newsweek, 24 Feb. 2025 Include sculptural elements Remember the famous optical illusion Rubin’s vase? The Washington Post, San Diego Union-Tribune, 4 Jan. 2025 See All Example Sentences for optical illusion

Word History

First Known Use

1763, in the meaning defined above

Time Traveler
The first known use of optical illusion was in 1763

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Cite this Entry

“Optical illusion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/optical%20illusion. Accessed 7 May. 2025.

Kids Definition

optical illusion

noun

Medical Definition

optical illusion

noun
: visual perception of a real object in such a way as to misinterpret its actual nature

More from Merriam-Webster on optical illusion

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