A book having a plurality of pages bound together to form the book. At least one page of a spread of the book has a flap movable with respect to the page. The flap has a flap recess. The page has a page recess. In a closed position, the flap is positioned within the page recess. A structural element, such as a pop-up element, is housed within the flap recess and/or the page recess. As the flap moves from the closed position to an open position, the structural element moves or raises above the page surface to move the structural element into an activated position. In the closed position, the structural element is hidden from view when looking at the page.