Other answers here about the vestibular system and vision are good, but it’s also worth noting that your vestibular system can influence your eyesight, and that’s why the room might also ‘look’ like it’s spinning. Basically, your brain tries to keep your eyes fixed when you move, and uses vestibular input to do that, kinda like OIS on a camera.
If you watch the eyes of someone who’s dizzy, they’ll move around as if they were tracking a fixed point in an actually spinning room!
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