Book excerpt: What's a clown to do when the circus shuts down and he loses the ability to smile? In Bobo's Smile, author and illustrator Seymour Chwast traces a clown's quest to regain happiness. Bobo flies around the world, visits new lands, scales mountains, and plumbs the depths of the sea, but his search seems to have been in vain—until an unfortunate event prompts him to use his talents and find joy in life's simple pleasures once again.