Super nice art hack here:
“Random Screen” is a mechanical thermodynamic display which does not rely on any electricity. Each of the 12 by 12 cm pixels is an individual entity. A tea candle lights and controls each pixel. The rising heat of the candle turns a modified beer can which turns the pixel on and off. Each pixel has its own frequency. The more bright a candle shines the faster is the rotation of the can. Each pixel is built as a separate module. Random Screen keeps growing.
Looks like it would be a fun project to work on for next Christmas. Put two tea lights in each cell one with a red gel and the other a green one and you might get some no-power pseudo random Christmas goodness.
[via we make money not art]