Grades K–2 · Machines
How does opening a pop-up book lift a paper shape?
A flat book can open into a little paper scene. In a pop-up book, some paper parts are joined to the pages. These parts have planned folds, called creases.
In the diagramOpening pages move their attached paperPaper boxCreaseTabOpen pagesTwo attached tabs link the paper shape to the pages
As the pages open, they move the attached parts. The parts turn at their creases and rise above the page. The pictured folded box is joined to the pages by paper tabs.
Closing the book brings the pages together again. The creases let the box fold down between them. The shape is not lifting itself: moving pages move the joined paper.
About this explanation
Starting knowledge: Recognize open and closed pages and a crease where paper can fold.
Sources
- Smithsonian Libraries and Archives — The Fascinating Art of Paper Engineering: Pop-ups