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Paper-engineering (including pop up books) is a source of endless fascination to me, and I love producing this kind of work. Any paper-engineer worthy of the name can make wonderful things happen with bits of folded card, but the process can be expensive - both in its use of materials and in assembly.

Every fold, every glue point, every hand operation costs money, and so commercial viability depends upon being able to design mechanisms that are both cheap and effective. An efficient and minimalist approach is necessary - as with any form of engineering - and it's this challenge that I find most satisfying; maximum effect at minimum cost.

Most of the examples here are illustrated by me. 'Humpty Dumpty' is illustrated by Moira Kemp.