CDC? is a children's puzzle book written and illustrated by author and cartoonist William Steig. Originally published in 1984, it is a sequel to his 1968 picture book CDB! and is of the same concept: letters and numbers that suggest the sounds of words or phrases are printed as captions for interpretive cartoons. The reader guesses what the letters and numbers are supposed to represent in actual words: the book's title, for example, represents the question "See the sea?" Source: Wikipedia (en)