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Plum

Fraser spiral illusion (en.wikipedia.org)

submitted 2 months ago by Plum to c/wikipedia

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[–] moistclump 4 points 2 months ago

Ohh I thought the illusion was maybe that it moved or something but no, turns out it’s not a spiral at all? Just circles. Trippy.

It is a unique illusion, where the observer can verify the concentric strands manually.[3] When the strands are highlighted in a different colour, it becomes obvious to the observer that no spiral is present.[4]