In reply to Roy Scholten.

For a somewhat in depth look at Luhmann's zettelkasten , I made a rough translation of this talk: https://vimeo.com/173128404 here: https://docs.google.com/document/d/1re3lYaALScZ49189XIGqUVjQlMPe9uOfLEyz8y7mJuE/edit#heading=h.ygj23kjvy5z

Johannes Schmidt: Der Zettelkasten als Zweitgedächtnis Niklas Luhmanns from Labor für Kunst und Technik on Vimeo.