Besides "the complex digestive tract of a ruminant", 0e1 Luhmann also used Zettelkasten as "a septic tank - don’t put in only filtered notes. Delay examining and deciding - and a question of speed". 0e2 But most importantly, Stellordnung 0b makes branching 0b3 easy so Zettels can be added quickly.

keywords: #septic-tank

There are two Zettels on the Zettelkasten itself (self-reference):

The Zettelkasten as a septic tank - don’t put in only filtered notes. Delay examining and deciding - and a question of speed.(Zettel 9/8a2) The Zettelkasten with the complex digestive tract of a ruminant. All arbitrary ideas, all randomness of the reading could be included. The inner compatibility matters. (Zettel 9/8i)

This is a very direct translation to give you an idea of what he actually wrote on a Zettel.

-- Sascha2016

Zettelkasten als Klärgrube – nicht nur abgeklärte Notizen hineintun. Aufschieben des Prüfens und Entscheidens – auch eine Tempofrage.

-- ZK II 9/8a2