Haidinger's brush

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Haidinger's brush, more commonly known as Haidinger's brushes is an image produced by the eye, an entoptic phenomenon, first described by Austrian physicist Wilhelm Karl von Haidinger in 1844. Haidinger saw it when he looked through various minerals that polarized light.

Excerpt from the Wikipedia article “Haidinger's brush”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Daniel P. B. Smith (User:Dpbsmith), CC BY-SA 3.0, via Wikimedia Commons.