When you press down on your eyeballs, what produces those visuals, or kaleidoscope-like colors?
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The visuals you’re describing are called [phosphenes](https://en.wikipedia.org/wiki/Phosphene), and they’re the result of you directly stimulating the cells in your eye. Normally, those cells are stimulated by light, and that’s how your brain interprets that stimulation, but they can also be stimulated by pressure, radiation, magnetic fields, or even randomly fire on their own. In this case, the pressure on your eyeballs is triggering those cells to fire.
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