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It s difficult to imagine the children s book landscape without Dr. Seuss, who is, almost half a century after The Cat in the Hat, the best-recognized children s book writer in the country. But until Dr. Seuss -- a.k.a. Theodor Seuss Geisel -- reinvented the genre with his colorful and exuberant Sneetches, Grinches, Zaxes, and Zooks, children s books were often little more than literal-minded lessons and cautionary tales intended to transform young readers into productive citizens.