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Philosopher John Searle talks about reduction, and details a number of the scientific phenomena that are what he calls “textbook models of reduction.” Some of these include color, light, and the heat of a gas. Professor Searle goes on to say that it’s fine to talk about rainbows in reductionist terms, because a rainbow is really just the appearance of something. There aren’t really stripes in the sky. But it’s not accurate to talk about consciousness in the same way, Professor Searle maintains, because consciousness is not an illusion.
Source
The Engineering of Conscious Experience
AI, Art & Consciousness