how do we know if we perceive colours the same way?
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Short answer : no. You cannot detect anyone that perceive colours the same way , as long as what he perceives is in bijection with what you perceive. It’s only when there is an injection (at least two colours peirceived as the same) that you can detect it. Same thing for knowing if other people really exist , or if you’re the only person that exist , and all around you is simulated. There is no way to know if people exist , the same way you exist
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