There is a “real” world, out there, but we do not perceive it directly. It is assembled by the sensory and nervous systems of each individual animal, and it is assembled differently by every one of them. What we perceive is a construct. Every animal’s perception of the world, constructed by its evolved sensory apparatus and nervous system to take best advantage of its environment, is subjective—there are no colors out there, as we perceive them, waiting for us. There is no sound—only waveforms. And perhaps the strangest fact of all: Outside our bodies, there is no pain. Pain is something we
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