What causes those weird colorful patterns when you rub your eyes?
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Bonus ELI5: this is also a nice illustration of a topic in philosophy called the form/object distinction: the difference between a thing you perceive and the way you perceive it.
Normally, we perceive the pressure our own hand applies to another part of the body (object) as the ordinary sensation of pressure (form). But when you press on your eye, you perceive the pressure in two forms simultaneously: the usual way and visually.
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