The Sèvres Vase Clock, a design by Georgios Maridakis at the Royal College of Art, taps a vase you already have, every hour, and its tone can be adjusted by varying the amount of water inside.
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.