The Catcher in the Rye. A Clockwork Orange. The Great Gatsby. Some book covers are almost as iconic as the words printed between them. To evoke the essence of a story while maintaining the mystery of the unread words within is an artform, indeed – and quite often an unsung one. That's why we're so excited for the 50 Books/50 Covers exhibit going on now at the Chronicle Books on 2nd Street. The event features selections from the American Institute for Graphic Arts' juried picks of the 50 best-designed books and book covers for 2008.