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Timesong senses the distance and motion of a viewer, responding with sound and moving light compositions. It also is a clock, and chimes the hour with a different sounding chime each hour. It uses an eight-bit computer to compose variables in; harmonic content of the sounds, sequences of light and sound, and the qualities of its response to the distance and motion of a viewer. With no viewer present, it 'sleeps' quietly, occasionally playing a short tune from its current repertoire, at widely spaced random intervals. It's compositions are derived from very large numbers, almost eliminating the possibility of a repeat performance.

This is a sample of tunes the device composes.
You can download the audio file (.mp3, 78 sec, 1.2MB) .

Another clock.