Three pieces of creative goodness.

First, a nifty animation technique using folded bits of paper found via @alphanum3ric

VIDEOGIOCO by Donato Sansone from Enrico Ascoli - Sound Design on Vimeo.

Second is the work of Drzach & Suchy creating images from shadows that change dependent on the direction of the light source. Sorry can't remember where I found this one.

And finally the "hand from above", which is sort of an augmented reality, interactive crowd pleaser type thingy, found via @mattklippel

Hand from Above from Chris O'Shea on Vimeo.