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Re:Letterlocking by akeck on Tuesday March 23, 2021 @01:41PM (#26557817)
There's a sub-culture of origami related to this called "Envelope and Letter Folding".
Re:Letterlocking by anorakoverflow on Tuesday March 23, 2021 @03:18PM (#26559126)
Looking at the links in the Wikipedia article I discovered this wonderfully “old web”-style page with various envelope folding guides[1]. I found it so endearing that I sat down and tried a few of them out, which was great fun.

[1] http://www.orihouse.com/elfa.html