WhySpiralHallucinations

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https://plus.maths.org/content/os/issue53/features/hallucinations/index - Uncoiling the spiral: Maths and hallucinations. About why hallucinations of different origin contain spirals

Also see http://www.pchr8.net/f/index.php/Scientists_Think_Cavemen_Painted_While_High_on_Hallucinogenic_Drugs about those same patterns appearing in prehistoric cave art