(Video Link)
Swiss artist Zimoun builds sound installations that create a unique audiovisual experience. This video is a compilation of many of his projects, including listening to woodworms at work using a microphone, an automat with selections representing different cities, and pvc hoses flopping about under the force of compressed air. You can see an archive of project-specific videos at the above video link.
Official Website via Make
Some are more effective than others, of course, but they're wonderful.