This concept watch Alexandros Stasinopoulos uses three interleaved tapes to tell time. I have no idea if it'd be possible to build this, but man, I want one.
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.