Organ of Ruben's tubes
A set of rubens tubes tuned like a set of organ pipes, so different tubes will hit resonance at different pitches, so as you scan the frequency the resonance will move between the pipes.
The tubes are arranged so they are all horizontal, but stacked on a slope so they can be seen from the front, without cooking each other.
The holes in the tubes are close enough together that the tube will relight itself which makes it much easier to use and safer.
Every tube has its own flow valve so the flame lengths can be balanced.
It folds flat for easier transport.
The overall effect is impressive.
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Demonstration
Commission