Shadowcloud

"A shadow cloud is a three-dimensional object, consisting of multiple shadow-casting elements semi-randomly arranged in three dimensions. A shadow cloud can be viewed as a generalization of shadow casting panels, but of course the basic idea is already present in the so called GEB-triples.

For more information about shadow cloud, please see the how-to page and watch the video, which present the basic idea, potential applications and some prototypes."

I found this while perusing itsnicethat.com and thought it was totally amazing.

Shadowcloud infostuffs