Firefly + Kangaroo

This is way too awesome not to post:

Firefly Vision tools + Kangaroo Physics from Daniel Piker on Vimeo.

Two grasshopper plugins, Kangaroo physics and Firefly, are used to enable direct interaction with Grasshopper geometry using a webcam. ┬áCan’t wait to see the kinect version.

Found on grasshopper3d.com