Cover the middle seam with your finger, marvel as the contrast effect changes EVERYTHING. Jason Kottke thinks the creator is a witch. When I showed it to my daughter, she said, "Well, your finger is covering up the light that's making it brighter," which is true in a weird sorta way.
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.