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Opening an intricately-folded "locked" letter from c.1700
Tuesday March 2, 2021. 06:55 PM , from BoingBoing
When I was in junior high school, in those better days before texting, kids communicated by passing intricately-folded handwritten notes. Using complex folding techniques so that the paper becomes its own envelope, a process called 'letter locking' actually dates back hundreds of years. — Read the rest
https://boingboing.net/2021/03/02/opening-an-intricately-folded-locked-letter-from-c-1700.html
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