rotating-head-illusion-1

Artist Markus Raetz created this amazing illusion by ingeniously synchronizing two rotating carousels of silhouettes so that they appear to depict a rotating head.

[youtube http://www.youtube.com/watch?v=VHcxF-wxSXU&w=560&h=315]

This would make an incredible set of ceiling fans!

[via Colossal]