The use of a napkin to illustrate, design, invent, or otherwise explain some kind of engineering topic, theory, process, or equipment.
Envelopes, hands, and other generally small pieces of paper can be substituted.
Aristotle- How was the napkin ring invented?
Plato- I drew it on the back of a napkin.
Aristotle- Oh, napkin engineering. Toss the fris!
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Napkin Engineering
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