Consciousness has scientists of all kinds scheming. Dr. Piet Hut, a physicist, offers this sketch: the objective world (o), with person and chair; the subjective experience of the world (s), in the balloon; the empirical understanding of the world, including physics (o prime), in the smaller rectangle; and the empirical understanding of subjective experience, including psychology, (s prime), in the really small balloon. Dr. Hut argues that when s and s prime are conflated, confusion reigns.

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