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Acknowledgements

Thanks to: Roz Picard; Thad Starner; Neil Gershenfeld; Sandy Pentland; Jennifer Healey; and Matt Reynolds, KB2ACE, for much discussion, inspiration, and the like. Thanks to: HP labs; VirtualVision; Compaq; Ed Gritz; BelTronics; M/A-Com; Virtual Image Displays, Inc.; and Virtual Research for lending or donating equipment that made my experiments possible.