David Pearson, a plastic surgeon, has a fun hobby: photoshopping Escher/Droste-style remixes of watch-faces, combination-lock dials, and other round readouts and twiddles.
(Image: Antique Time Spiral, used by permission)
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.