The deceptively simple chart progresses from the decidedly not-human (a factory robot, for instance) to something that would be indistinguishable from ourselves (whether it's a perfect computer graphic or these guys). One might guess that as the objects in questions become more human, they become more familiar to us, and so it goes. Until, that is, we hit the uncanny valley. Once the robot or graphic or toy or not-quite human creature becomes too human like (and yet not human like enough to be indistinguishable), we can't handle it. Viewing these things stimulates a feeling of repulsion (they're familiar! Yet unknown!) not readily eradicated. If we hope to make a future where robots are folded into the mainstream, the argument goes, we must be mindful these potential obstacles.