Here’s a really neat way to see sound waves… With fire! I think if I ever make a fireplace, it’ll have something like this. Twinrawk writes – “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.” [via] – Link.

Other things, with fire, on MAKE – Link.