Mo Willems is the author of the Caldecott Honor’s Book Don’t Let the Pigeon Drive the Bus and a few dozen other children’s books. On May 5, 2011 he delivered the Zena Sutherland Lecture at the Chicago Public Library titled Why Books? This article from Horn Books is an adaptation of the lecture.
Last week I was having a conversation about exactly this topic with my son who has two young children. I think you’ll find the definitive answer to that question in this article.
Hat Tip to Imagination Soup