The Cat in the Hat book's title character in the tradition of con artists in American art, including the title characters from Meredith Willson's "The Music Man" and L. Frank Baum's "The Wonderful Wizard of Oz". Nel also contends that Geisel identified with the Cat, pointing to a self portrait of Geisel in which he appears as the Cat, which was published alongside a profile about him in "The Saturday Evening Post" on July 6, 1957. Michael K. Frith, who worked as Geisel's editor, concurs, arguing that "The Cat in the Hat and Ted Geisel were inseparable and the same. I think there's no question
The Cat in the Hat for the series, including "The Cat in the Hat Comes Back" (1958), "Green Eggs and Ham" (1960), "Hop on Pop" (1963), and "Fox in Socks" (1965). He initially used word lists of limited vocabularies to create these books, as he had with "The Cat in the Hat", but moved away from the lists as he came to believe "that a child could learn any amount of words if fed them slowly and if the books were amply illustrated". Other authors also contributed notable books to the series, including "A Fly Went By" (1958), "Sam and the Firefly" (1958), "Go, Dog.