>>> Sound "images" are common for sonar systems. And ultrasound imaging
>>> devices, for that matter.
>> That's not "taking a picture of sound". That's "using sound to take a
>> picture". If you want to split hairs, anyway... ;-)
> 
> Interestingly, you can kind of 'take a picture of sound'. I've seen a couple of
> videos on youtube of extremely high-speed film footage (i.e., extreme slo-mo
> when played back at 25fps), including one of a car being blown up. As the charge
> goes off, you can clearly see the shockwave propagate as a glassy shell.

Yeah, Invisible Worlds did this. They detonated a big stack of 
gunpowder, and you actually can see a visible shockwave. It's vaguely 
visible even at normal speed, but in super slo mo it's very clear.

It looks Photoshopped.

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