I cant remember its name but what i understand the general idea to be is a piece of PVC pipe has man holes drilled in it then a flamable gas (butane ect) is passed through it and lit in fire. Then waves are passed through the pipe and the fire shrinks and grows based on the frequency.
Its more complex than this to make but thats the general idea
Its more complex than this to make but thats the general idea
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it's called a Ruben's Flame Tube. See it in action in the video!
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Perhaps it is fibre optics