Interesting. I prefer to use emergent "categories" rather than a predetermined set. Similar to how Luhmann did it originally. Most of my top-level cats are pertaining to my Grand Theory of Optimal Education but this is not a rule. Additionally, I do indeed get away from the topical content the further down I go naturally. 7 = Lifelong Learning 71 (or 7.1 for readability) = Reading 71/1e2 = Intellectualism vs. Learning with regards to critical analysis and thinking 71/1e2a = Original Thought I could've created original thought as its own branch but I found it related enough to a card on reading I made (particularly with regards to intellectualism) to insert it there. Warm regards, Mr. Hoorn