There are many types of pop-up books, but however simple or complex, what they have in common is a three-dimensional aspect when they are opened. This book, which I made for the Sydney BAG exhibition to complement my Alphabet 1 print, is the simplest type of concertina pop-up. Each page has just two horizontal cuts in the paper, allowing part of the paper to fold one way, part of the paper to fold the other way—resulting in the formation of a moveable parallelogram. This book opens to more than 2.5 metres long, and folds up to less than 50 mm deep.

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