All picturebooks are puzzles. The details of pictures invite attention to their implications. The unmoving pictures require viewers to solve the puzzle of what actions and motions they represent. The pictures in wordless books require viewers to solve the puzzle of what story they imply. In books with texts, the words and pictures together tell different stories that require readers to solve the puzzle of how to connect them. The pleasure of picture books is not just in the stories they tell but also in the game of figuring out what those stories are.
– The Pleasures of Children’s Literature, Nodelman and Reimer