Coolest Artwork Ever

OK, so I think the coolest thing I saw at the National Portrait Gallery wasn't the collection of presidential portraits, or the 10x life-size picture of Angelina Jolie. It was this collection of license plates from all fifty states, plus the District of Columbia. And if you don't think it's that cool, then read it. This piece is called Preamble, and the artist is Mike Wilkins. Wish I'd thought of it.