Eli5 why does pressing my palms against my eyes create a kaleidoscope effect?
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Your eyes are very delicate and sensitive instruments. Pressing them will physically stimulate the cells into firing off signals to the brains the same way getting smacked on the side of the head gives you ringing in the ears. FYI this is damaging to your eyes and prolonged or repeated presses WILL damage your eyes so you should avoid this or any aggressive rubbing.
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