Two little blobs of color, one yellow and one blue, are extremely close friends. One day they get too close, and, to their dismay, they turn green. Confusion upon confusion develops with the family of each refusing to acknowledge the children. Leo Lionni, the art editor of Fortune magazine, treats this basic law of color with grace and humor. A somewhat slight idea, but one which should delight the whimsical minded young reader with its lighthanded fluency.