h a l f b a k e r y
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A series of parallel horizontal tubes with holes bored in them at regular intervals, each soundproofed and carrying flammable gas. A speaker is situated at the end of each tube and the gas is lit along the holes. Various sounds are played lasting exactly as long as the time taken for the sound to travel
the length of the tubes, carefully designed to generate particular patterns of wave. The denser parts of each wave produce higher and brighter flames than the more rarefied parts. A mirror is placed above the array at an angle to allow the picture to be viewed without the danger of burns.
At the other end, a fairly conventional camera provides signals, each consisting of a sound based on the brightness of the horizontal strips of the image before the camera. The signal is fed to the speaker.
What i'd like to do with this is get rid of the electrical component entirely.
Source of this idea. [nineteenthly, Mar 04 2009]