"We can ask: if consciousness is reducible to computation, then what kinds of computation suffice to bring about consciousness? What if each person on earth simulated one neuron in your brain, communicating by passing little slips of paper around? Does it matter if they do it really fast?
Or what if we built a gigantic lookup table that hard-coded your responses in every possible interaction of at most, say, 5 minutes? Would that bring about your consciousness? Does it matter that such a lookup table couldn’t fit in the observable universe? Would it matter if anyone actually consulted the table, or could it just sit there, silently effecting your consciousness? For what matter, what difference does it make if the lookup table physically exists—why isn’t its abstract mathematical existence enough?"