In the beginning of 2020 I decided to visit our University here in Bielefeld to see the original Zettelkasten in the flesh - errm paper. Then we all know what happened.
Did you know that the University is digitizing the Zettelkasten step by step?
6000 Zettel are already scanned. Lots of them transcribed, the Meta Data extracted and you can click through whole Zettel-Strecken.
Here is the the Link to Zettel 1
Until now it is all in German
But I think it is still very usable with a translation service.
And even without it translation it is just a lot of fun to click through Luhmans work
I did not find anything about the project about the beginning digitization of Luhmanns Work, so I hope that it is helpful for some here.