pop-up book is often applied to any three-dimensional or movable book, although properly the umbrella term movable book covers pop-ups, transformations, tunnel books, volvelles, flaps, pull-tabs, pop-outs, pull-downs, and more, each of which performs in a different manner. Also included, because they employ the same techniques, are three-dimensional greeting cards.
Design and creation of such books is known as paper[paper?:paper sample maker cutting machine] engineering, a term not to be confused with the term for the science of paper making. It is akin to origami in so far as the two arts both employ folded paper. However, origami in its simplest form doesn't use scissors or glue and tends to be made with very bendy paper, pop-ups rely on glue, scissors and stiff card. What they have in common is folding.
