The illusion of self-awareness. Happy automatons, running on trivial programs. I'll bet you never guess. From the inside, how can you?
Vernor VingeHexapodia as the key insight...I haven't had a chance to see the famous video from Straumli Realm, except as an evocation. (My only gateway onto the Net is very expensive.) Is it true that humans have six legs?
Vernor Vinge