These innovative books are designed to be read one page at a time. Grab hold of the last page, however, and the illustrations stretch out to a stunning 2-sided panel. Airplanes features the story of flight on one side and the cross section of a Boeing 747 on the other. Skyscrapers features an assortment of the world's tallest structures on one side and the cross section of the John Hancock Center on the flip side. Full-color illustrations.