Carefully leveled text and vibrant photographs introduce early readers to the concept of opposites by encouraging them to compare things that are wet with things that are dry.
Short passages about life in the country and city introduce the concepts of behind and in front, from horses standing behind a fence to a bus driving in front of Big Ben.
Short passages about animals in their natural habitats introduce the concepts of over and under, from a bear cub climbing over a log to fish swimming under the water.
Short passages about everyday life introduce the concepts of left and right, from a child getting out of the bed on the right to riding the slide on the left at recess.