Impossible trident

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

An impossible trident, also known as an impossible fork, blivet, poiuyt, or devil's tuning fork, is a drawing of an impossible object (undecipherable figure), a kind of an optical illusion.

Excerpt from the Wikipedia article “Impossible trident”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: AnonMoos, Public domain, via Wikimedia Commons.