Solipsism is the philosophical idea that only one's mind is sure to exist. As an epistemological position, solipsism holds that knowledge of anything outside one's own mind is unsure.
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To some extent. I don't actually see the world, just light projected into my eyes. I don't hear the world, just vibrations in my head. The nerve endings in my skin could be lying about what I feel.
Then I realize it doesn't matter, because either way, this world interacts with me in a way that the real world would.
