Paul Zelinsky won awards for "Rapunzel" and "Rumpelstiltskin," and he worked with Beverly Cleary on "Dear Mr. Henshaw" and "Strider." In yet another burst of creativity, he illustrated "Swamp Angel," which was a kind of response to "Paul Bunyan" and "Johnny Appleseed." ("Swamp Angel" is an American tall tale--but, at last, it's a tall tale with a female protagonist.) This would be enough for many artists, but, in yet another phase, Zelinsky *also* made the pop-up book that critics have called the greatest of all time. That's "The Wheels on the Bus." You might not think this song has a plot, but it does. The wheels go round and round, and all's well--but then the lyrics suggest that something has changed. The wipers go swish; the windows go up. Why? The clouds must have gathered; it's raining. It's this change in weather that fires Zelinsky's imagination. The portly driver...