The classic physics experiment involving sound, a tube of propane and fire. Created for Flash Forward 2006, but useful in any case where you are not allowed to have fire. I push through the tube 449 Hz then higher frequencies, then some jazz and then some rock. This is real life sound visualization.
![Ruben's Tube](https://cdn-ak-scissors.b.st-hatena.com/image/square/b2e12ac0a553ea27fa40eb37a1dd6faea710de8d/height=288;version=1;width=512/https%3A%2F%2Fi.ytimg.com%2Fvi%2FHpovwbPGEoo%2Fhqdefault.jpg)