Artist Daniel Bejar had a key copied and then a new key copied from it, and so on, until the information embodied in the original key had been lost. He calls the resulting piece "The Visual Topography of a Generation Gap": "A copy was made from my original apartment key, then a copy was made from that copy. This process was repeated until the original keys information was destroyed, resulting in the topography of a generation."
"The Visual Topography of a Generation Gap"(#2, Brooklyn, NY) (Thanks, Fipi Lele!)
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.