You might think that "One Fish Two Fish Red Fish Blue Fish" is a Dr. Seuss book about counting or colors (or counting and colors or even counting colors), but that would simply be the hook for something much larger. The thesis of this Beginner Book appears opposite the first page, where we are informed by a small creature with a giant mustache and a yellow star for a belly button that "From there to here, from here to there, funny things are everywhere." If anything this Dr. Seuss book has bits and pieces from lots of other Dr. Seuss books. You have a series of opposite because fish are not only red and blue but old and new, you have Ned who does not like his bed, there is Yop who only likes to hop from finger top to finger top, and all sorts of strange looking animals. There is even a creature that looks like the Cat in the Hat except he is completely yellow, including his hat, has a polka dot bow tie, and eleven fingers.
Consequently, if "One Fish Two Fish Red Fish Blue Fish" is one of the first Dr. Seuss books that a beginning reader begins reading they should go back and read it again after they have gone through the rest of the good doctor's books because they will then be better able to appreciate some of the familiar faces in this book. However, since this is not a book for early beginning readers, most kids will get to this one after they have covered the basic Dr. Seuss books and become well accustomed to his delightful volumes of rhymed absurdity. This particular book has been inspiring the imagination of beginning readers since 1960 and there is no reason for it to stop with that endeavor at this point in time.