dubbed “folgezettel” or “follow-up note,” allowed Luhmann to work non-hierarchically. Ideas were no longer bound to topics, listed alphabetically, or cataloged according to consecutive prime numbers only, all of which would have created a linearly organized system.
Bob Doto • A System for Writing: How an Unconventional Approach to Note-Making Can Help You Capture Ideas, Think Wildly, and Write Constantly - A Zettelkasten Primer
The trick is that he did not organise his notes by topic, but in the rather abstract way of giving them fixed numbers. The numbers bore no meaning and were only there to identify each note permanently. If a new note was relevant or directly referred to an already existing note, such as a comment, correction or addition, he added it directly behind
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