His first interactive sound installation. Construction of some very bulky 8 x 8 pixel video cameras, connected then to a wire-wrapped card in the Apple ][ which digitized the images, and wrote a program for the Apple ][ which controlled a Korg MS-20 Analog synthesizer to make sounds in response to the movements seen by the cameras. Movement also controlled the volume of two tape loops of water sounds. The synthesizer and water sounds were mixed individually to 4 seoakers in a tetrahedron. The sounds would move around you in addition to responding to your movement.
Reflexions always had a visual component. (source: http://homepage.mac.com/davidrokeby/reflex.html)