Whoa. Alan Kay does what looks roughly like a Powerpoint presentation about the history of computing (the coolness leaks through once, when he authors a little in the middle, but not much). Half-way through, they begin to demonstrate Open Croquet, a 3d collaborative environment on two screens. Screen left is travelling around a tabletop world, looking in portals to different 3d scapes. Pretty cool. Then Kay, on the right screen, zooms out: the entire presentation has been in a scape, a window in this collaborative environment. !