via Lumanoise
"The Lumanoise is a simple electronic circuit, based on square-wave oscillators, sawtooth and sine.
The pitch of these oscillators is controlled by the amount of light it receives througha photoresistor, the most 'is the light, the more' pitch will be high.
The first circuit model used was the Micro_noise, designed by the Swiss Union DIY Make Away, 4093, based on the chip. Later versions have been developed based on the original 40106 and 4040 chips specifically for live Megatsunami."
Great pics of the wood grain matching up to the artwork.
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