This is a lovely shadow art video created by Jason Eppink, called the shadow machine.

 The Shadow Machine was conceived of and created for the The Underbelly Project, an extraordinary, unauthorized exhibition of more than one hundred international street artists in an abandoned subway station in New York City. The Shadow Machine’s projected, ghostly figures hammer away in complete darkness at the far end of the platform, ever-toiling     spirits working on a never-finished station that was abandoned generations ago.
 This is a new Art21 documentary on William Kentridge, wouldn't let me embed it for some reason so go and watch it because it is very good!

 Rachael Whiteread
Study (Blue) for Floor