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The ten basic paper engineering mechanisms shown in this book have an almost explosive quality. Each uppop folds flat, but when it is eased out of its envelope or restraining sleeve, it suddenly and unexpectedly jumps into a threedimensional shape. This element of surprise is most attractive and suggests all kinds of imaginative designs. The motive power for each mechanism is provided by a single elastic band. With each example there are useful notes about the mechanisms and suggestions for further development of the ideas to create original designs.
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