Amazon.com description: Product Description: This is truly the ultimate interactive pop-up book and toy! Find out how different construction trucks help with the construction of a building. Five trucks, each with unique moving parts, can be placed on tracks in four different construction scenes. Kids slide the trucks on the tracks to help "build" on the construction site. The final pop-up spread is a thorougly satisfying finale to this engaging format. What a great way to get reluctant readers to pick up a book!