In the mid-1980s, visual artist Ron Rocco, who also developed his work at CAVS, employed mirrors mounted to tiny servo motors, driven by the audio signal of a synthesizer and amplified by a tube amp to reflect the beam of a laser. This created light patterns which corresponded to the audio's frequency and amplitude. Using this beam to generate video feedback and computers to process the feedback signal, Rocco created his "Andro-media" series of installations. Rocco later formed a collaboration with musician David Hykes, who practiced a form of Mongolian overtone chanting with The Harmonic Choir, to generate cymatic images from a pool of liquid mercury, which functioned as a liquid mirror to modulate the beam of a Helium-Neon laser from the sound thus generated. Photographs of this work can be found in the Ars Electronica catalog of 1987.