Pop Up Hardback Book Very Good Condition. Example of pop up shown in images. “Machines: A Moving Book with Gears, Levers and Pulleys” is a unique pop-up book that offers a hands-on learning experience for adult learners and university students. The book features intricate pop-up diagrams and models of gears, levers, and pulleys in motion, making it a visually engaging textbook for studying machines. With its engaging format and informative content, this book is a valuable resource for those interested in the world of mechanical engineering and machinery.