An easy-to-read story helps students take on our STEM challenge with confidence! The relatable characters in our storybook introduce the design elements that make a perfect tree house—inspiring students to jump right into building. We’ve included all the pieces kids need to complete every step—so it’s easy to read, plan…and build. The set includes a durable wooden tree, 138 plastic builders, 4 weighted people, a 20-page storybook and a guide. Tree measures 20" tall.