The term 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. “These are books that contain text or illustrations that can be moved or manipulated, more than in the turning of an ordinary page. They are also called ‘action books’ or ‘special effects books’.” Some examples include: 3-D books, Board books, Glow-in-the-dark books, Lift-the-flap books, Light-up books, Pop-up books, Puzzle books, Scented books, Sound panel books, Sticker books, textured books, and Toy books.
Many people associate the Eastern art of folding paper forms, called origami, with techniques of paper engineering. Few origami structures are designed to more - most are static- and thus, movement differentiates pop-ups from origami.