Eye/Brain Candy: Light Painting/Stop Motion animation with an iPad as the light source.
Really beautiful stuff. The first 1:38 of the video at the link give you a quick how-it-was-done account, and then the really lovely video unfolds.
I got this through a retweet of @GreatDismal’s twitter stream — and as Mr. Dismal resolves to William Gibson in meatspace, I suppose my reaction — that Hubertus Bigend is smiling somewhere — makes a kind of sense.