Troxler's fading

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Notion

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Science and technology

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What Wikipedia says

Troxler's fading, also called Troxler fading or the Troxler effect, is an optical illusion affecting visual perception. When one fixates on a particular point for even a short period of time, an unchanging stimulus away from the fixation point will fade away and disappear.

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

Image: Bautsch, CC0, via Wikimedia Commons.