Anil Agrawal: We're living controlled hallucinations. This might be how things seem, but it's not how things are. The idea is the brain doesn't read out the world. It kind of writes the world. What we experience is the brain's best guess. There's this essential indirectness between what we experience and what's really there. He says color isn't there in the world anyway. Evolution has developed our brains to experience color because it's useful, not because it exists.

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