Liminal is from the natural sciences, so he was inspired by this They're the basis for wikis, but wikis don't have stable content, so they're actually a different thing. The content of zettel isn't supposed to vary wildly or change 5 times per day. It's something you write down and keep, to use and rearrange later, like snippets cut out of paper.

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Yes! Good on point on the difference between snippets of source material vs linking to variable wikis. Noted! ✍️ (Reminds me of the book "Lila" by Robert Pirsig, where the main character Phaedrus uses a similar system of slips to organize his thoughts into a book)