"One Fish Two Fish Red Fish Blue Fish" is a 1959 work by Dr. Seuss. It has no central plot, but is instead just a series of unrelated rhymes and illustration, with the only unifying theme being "funny things are everywhere".
By the time that Seuss wrote One Fish, Two Fish, he had been writing and illustrating children's books for 23 years. This however, was the first Seuss book to be purely an exercise in imagination and rhyming, with the absence of either the narrative or moral lesson that characterizes his other works. It is also a book for beginning readers. Perhaps for these reasons, it is one of his more popular works.
Strangely enough for one of Seuss' more wild and non-linear works, the art in this volume is fairly tame. Although it has lots of Seuss' trademarked animals, odd furry beasts in various levels of anthropomorphism; it lacks Seuss' loopy, physics-defying landscapes. It also, perhaps for technical reasons, lacks the colorful palette of some of his later works. I don't know why this works lacks some of Seuss' artistic flair--- why don't you go ask your dad?