This design has since evolved into the Drone Jar.
Built inside a reused jar, this drone synthesizer consists of dual square-wave oscillators modulating against each other. The pitch of each is controlled by outside light sources hitting the two 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 9-volt battery. A red LED indicates power and a 1/4\” jack outputs audio.
This was hand-built in a numbered series of six.