He argues qualia by presenting his zombie argument, explaining that a philosophical zombie, an exact physical duplicate of person but without consciousness/qualia could exist. He is not saying that there is actually philosophical zombies that exist, instead, that it is conceivable that there are philosophical zombies. Even though I am confident that there are other minds that are conscious, it is not to the same degree of certainty that I can reach with myself, as only I can apply Descartes’ irrefutable logic ‘I think therefore I am’. We cannot confirm this consciousness through physical means, so it can be concluded that there are phenomenal properties of consciousness that are not physical properties.
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