In physics you learn about waves.
However, many people don't realize that waves are every where.
A rubens tube is a tube with natural gas pumped through it with holes in the top.
when a steady vibration is used on the tube, a standing wave is formed. It has nodes and anti nodes like any wave.
When you put a lot of vibrations through, like say music, the effect is very cool.
Most rubens tubes are just a linear single tube, in this video however, it goes into 2 dimensions
the result is amazing.