This design has since evolved into the Drone Jar.
Built inside a reused jar, this drone synthesizer consists of three square-wave oscillators modulating against each other. The pitch of each is controlled by outside light sources hitting the three light sensors inside, so there is a lot of room for experimenting.
All of the components are built in a three dimensional floating circuit that comes down from the lid of the jar.
There is a single switch on top for power which is supplied by an included 9v battery. Two red LEDs indicate power and a 1/4\” output jack makes it easy to connect to amps, effects, or recording equipment.
This was built in a numbered series of ten.