We get to see actual sound waves by a photographic technique called the
This technique can be used to see any change in air density caused by heat or motion.
Aural Porn
Excite Your Aural Orifices!
We get to see actual sound waves by a photographic technique called the
This technique can be used to see any change in air density caused by heat or motion.
Aural Porn 
I’ve never been a physics enthusiast given my propensity for chemistry, yet I thought it was kinda cool. Nice find!