Coil springs form flexible bindings for a new type of memorandum books. One edge of the covers and pages of the book are perforated with more than twenty holes and the coil spring is threaded through these holes to make a permanent binding, as shown above.
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.