In response to a post last week, Stephen Downes reminded me that Ludwig Wittgenstein had a zettelkasten practice. In particular there is a translated and published book Zettel from 1967 which contains 717 zettels from Wittgenstein’s Nachlass, or works left behind following his death in 1951. I’ve had a copy lying around for a bit, but finally spent some time with it. The book cleverly has a parallel text form with the German on one side of the page and the English on the facing page. I’ve also seen translations of the book in both Spanish and Italian for those who might prefer those.