Up/down, in/out, over/under, big/little, long/short. This glittering board book, filled with colorful images from Rainbow Fish's undersea world, is the perfect introduction for very young children to the concept of opposites. And in keeping with the classic picture book story, The Rainbow Fish, the book ends with the most satisfying opposite of all give/take, showing Rainbow Fish sharing one of this shining scales with a grateful friend.