I'd like to thank Thad Starner for helping me get the generalized spatial `visual filter' software running on the SGI Reality Engine. Thanks to: Roz Picard; Neil Gershenfeld; Sandy Pentland; Ted Adelson; Jennifer Healey; and many others, too numerous to mention here, for many interesting and important discussions; and Matt Reynolds, KB2ACE for help in upgrading the outbound ATV system. Thanks also to HP labs, VirtualVision, Compaq, Ed Gritz, BelTronics, M/A-Com, and Virtual Research for lending or donating equipment that made my experiments possible.