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There’s speculation, which is kind of creepy, that mirrors are actually a parallel universe. You’re literally looking at yourself in another universe, and they’re doing the exact same thing as you, and think the exact same things as you.
You can’t actually prove that it’s true, and you can’t prove that it’s not true, because if it is you in another universe, your reflection in the mirror will think and do exactly what you’re doing. Even if you try to trick yourself in the mirror to do something different, the other will think the same thing, and do the same as you, because they are you.