Exactly, and even if nobody has ever built it or written a formal proof that it would work, you can still imagine how it would work and prove it to your own min

Exactly, and even if nobody has ever built it or written a formal proof that it would work, you can still imagine how it would work and prove it to your own mind. (This would work for a purely mechanical computer made out of rocks, too.) Personally, with enough knowledge about how modern AI works, and a reasonable understanding of the neuroscience literature, I feel there is no fundamental mystery to consciousness, only awe at the level of complexity harnessed.