Sonasphere is an audio visual application for Mac OSX, which represents audio samples, effects and mixers as spherical objects within 3d space. These objects interact with each other in a generative way to produce interesting and complex audio visual results.
Sonasphere is the brain child of Nao Tokui, and I have been involved with the identity, interface design and art direction. Check out the video for a 3 minute explanation of what Sonasphere can do, otherwise got to the Sonasphere website to download it, and have a go.
An installation version of Sonasphere was exhibited at ICC in Tokyo, in an exhibition called N_ext: New Generation of Media Artists from April 23rd, 2004 - June 27th, 2004. The main application interface is projected from above onto the floor and users who enter the projection area have their movements tracked and fed back into the application. Users can manipulate and interact with the environment by walking back and forward. Thus changing the makeup of the environment and moreover the audio output. User movement is tracked by a CCD video camera mounted above the projection area. Max/Msp patch for User Detection here.