Eli5 why does pressing my palms against my eyes create a kaleidoscope effect?
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The cones and rods in your eyes respond to and code “sight” from detecting pressure from teeny tiny light wave-particles. When physical pressure is applied from your palms (don’t do this!) to the sclera, a similar sort of sensation is relayed to your optic nerves and you “see” colors. There are tales of Isaac Newton poking his eyes with needles to understand optics. Again, don’t do this. Probably not super healthy.
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