This is the definitive reference book for the aspiring paper engineer. The lifeblood of pop-ups is kinetic energy, or the energy resulting from motion. When a card or book is opened, wonderful things ...
https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!828834~!0#focus ...
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