This video, via Veritasium, features a 2D Rubens’ Tube ‘pyro board’ that translates audio waves into dancing flames, revealing the hidden waves in sound.
A Rubens’ tube, also known as a standing wave flame tube, is a tool for demonstrating standing acoustic waves. Invented by German physicist Heinrich Rubens in 1905, it graphically shows the relationship between sound waves and sound pressure.
The ‘pyro board’ takes the Rubens’ Tube to the next level, by visualizing audio across a plane, instead of just in a line.
The pressure variations due to the sound waves affect the flow rate of flammable gas from the holes in the Pyro Board and therefore affect the height and color of flames. This is interesting for visualizing standing wave patterns – and it’s also pretty sick when you drop the bass!