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 read, and Spaulding provided Geisel with a similar list. Geisel later told biographers Judith and Neil Morgan that Spaulding had supplied him with a list of 348 words that every six-year-old should know and insisted that the book's vocabulary be limited to 225 words. However, according to Philip Nel, Geisel gave varying numbers in interviews from 1964 to 1969. He variously claimed that he could use between 200 and 250 words from a list of between 300 and 400; the finished book contains 236 different words. Geisel gave varying accounts of how he conceived of "The Cat in the Hat".