A film with various clips including a computer display of some kind of geometric or field calculation, a simulation of different-size (and mass) balls colliding with a complex environment and each other under gravity; Ray Somonoff talking; somone on a bongo board, Rick Greenblatt, Marvin Minsky and a student watching a robot arm perform tasks, Alan Kotok and Stuart Nelson with  a PDP-6, and a brief view of Terry Winograd's SHRDLU program.