The Rubens' tube, also known as the standing wave flame tube, is a physics experiment demonstrating a standing wave. It shows the relationship between sound waves and air pressure.
German physicist Heinrich Rubens took a 4-metre-long tube and drilled 200 small holes into it at 2 centimeter intervals, and filled it with a flammable gas. After lighting the gas he noted that a sound produced at one end of the tube would create a standing wave, equivalent to the wavelength of the sound being made.
Some friends were chatting about various ways to visualise music.
They decided to create a Rubens' Tube.
(thanks Sam)
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