Vibrations and how they get to your ears.
Noise for airports is a blog about culture, sound, music, and technology.
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Updated (sometimes) by Nick Seaver.

This project (make sure to click through to play around with the Processing applet) uses data from an “acoustic camera” to create a 3-D model of sound, linked to an image of the sound’s source. It still seems to live in the “neat and pretty but what is it for” school of visualization, but man is it neat and pretty.