The Door is the first book released in the Teachable Moments Series, an ongoing collection of (almost) free children's books by Texas author, P.E.Harris. A fun book of poetry, with subjects ranging from day-to-day life and activities, to slightly more complex issues that allow the parent, guardian or teacher flexibility to teach and guide as they go. All books in this series are $0.99 (lowest price per site requirements) to download electronically, and physical books are available at production costs only.