A project out of MIT (excuse the cheesy production values on the video):

The Cloud is an organic sculptural landmark that responds to human interaction and expresses context awareness using hundreds of sensors and over 15,000 individually addressable optical fibers. constructed of carbon glass, spanning over four meters, and containing more than 65 kilometers of fiber optics, the cloud encourages visitors to touch and interact with information in new ways, manifesting emotions and behavior through sound and a dichotomy of luminescence and darkness.

Via Design Boom. (The cloud, unlit, is neat looking—like a blog obelisk from spaaaace.)