In case the child in the book seems familiar, that is because Crockett Johnson also wrote and illustrated the famous Harold and the Purple Crayon series. Harold is a little boy armed with a purple crayon, who draws his own adventures from his imagination. It was turned into a cartoon series, I believe on HBO. I always loved the sense of adventure that a young one could get from escaping into his own drawings. I think it is inspirational to kids to believe that they can do the same.
Together and individually, this powerhouse couple created numerous books for children. These are the two that stand out most in my mind.