Kyle McDonald at MIT has created a bunch of interesting audio/video/music Processing apps, including the Ambient Lapse program shown above (which uses both Processing and SoundStretch).

"Ambient Lapse" is a simple technique for capturing the ambiance of spaces, especially their color and spectral characteristics. It operates on a principle similar to long-exposure time-lapse, but allows exposures to overlap. Instead of producing momentary bursts of specific images, individual objects and well-defined perspectives, we're given vague impressions.

[via createdigitalmusic.com]