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“It may be that some are unwilling to accept the possibility of conscious thermostats simply because we understand thermostats too well. We know everything about their processing, and there seems no reason to invoke consciousness. But thermostats are really no different from brains here. Even once we understand brain processing perfectly, there will still seem to be no reason to invoke consciousness. The only difference is that right now, what is going on inside a brain is enough of a mystery that one may be tempted to suppose that consciousness is somehow “located” in those brain processes that we do not yet understand. But as I have argued, even coming to understand those processes will not alone bring consciousness into the picture; so here, once again, brains and thermostats are on a par. One might be bothered by the fact that one could build a thermostat oneself, without putting any consciousness in. But of course the same applies to a brain, at least in principle. When we build a brain (in reproduction and development, say), consciousness conies along for free; the same will go for a thermostat. We should not expect to locate consciousness as a physical component of the system! Some may worry about the fact that a thermostat is not alive; but it is hard to see why that should make a principled difference. A disembodied silicon brain of the sort discussed in the last chapter would arguably fail to qualify as alive, but we have seen that it might be conscious. And if the arguments in the last chapter are right, then the fact that a thermostat is not made up of biological components makes no difference, in principle.” — David J. Chalmers