A compliation of work by Swiss artist Zimoun:
Zimoun : Compilation Video V2.8 | Sound Sculptures & Installations from ZIMOUN VIDEO ARCHIVE on Vimeo.
I like this a lot, I think because it hits a couple of my buttons at once: (1) art as an environment to explore. I felt the same way about Rothko at the Tate Modern a couple of years ago - all those pieces together worked as a machine for engaging my senses and adjusting my mood by moving around the space. (2) noise as music - I'd happily listen to the sound these things make on (not too isolating) headphones, while walking around a city; environmental noise would add to it.
(Hat tip: BLDGBLOG.)