Music Technology
TV Bug

From the MAKE Flickr pool:

23N! (Flickr user zeni666) made this TV Bug noise instrument using a CRT TV, SN76477 noise chip, and 3 phototransistors. (Presumably) it works by feeding the output of the sound chip into the TV, where the resulting video signal then gets looped back into the circuit using the light-sensitive phototransistors.