Today I was in a videoconference. Sitting in the videoconference suite (in the same place as Richard Dawkins once sat: cor) there were two screens opposite me, one showing a live image of me and the other the same image after it had been through the network, with about half a second delay.
First I worked out that if I kept my head still, looked away with my eyes and looked back at the screen, I could see my own eyes apparently move independently.
Then I worked out that if I lifted up one hand and then the other very quickly, I could do a Mexican wave with myself.
That's what technology is for.