Terry Fugate-Wilcox, Aeon Aethesus, 1969, electronics and Plexiglas, 3 ft. tall (photograph © Terry Fugate-Wilcox)

This electronic instrument, shown in the exhibition Sound at the Museum of Contemporary Crafts in New York, did not have a keyboard based on a traditional piano. Players instead manipulated knobs, buttons, and switches. This interface allowed anyone to make sounds with no prior musical training.