Panel of neon relaxation oscillators.

This is a panel of neon relaxation oscillators that I made up a while back for fun. Each "pixel" consists of a neon lamp, diode, capacitor and two resistors. The resistor values are chosen to put the neon lamps on the very edge of oscillation, so they don't all continuously flash, but will go in random bursts depending on ambient lighting conditions and various other external factors. The panel runs directly on 240V mains (UK) and can "bite" if mishandled, although there is a high level of current limiting on each circuit.