A Zettelkasten isn’t a filing system: it’s a structure for building knowledge from small independent pieces. Each note is atomic in the way [[Evergreen notes should be atomic]] describes: one idea, stated clearly, connected to others by genuine relationship rather than category. The modularity is what makes it generative. You can combine notes in ways you didn’t anticipate when you wrote them. [[Lego-like structure]] is the architectural equivalent: defined interfaces between independent pieces make recombination possible.
The system produces insight rather than just retrieval, which is what distinguishes it from a folder structure or a database of highlights. [[Non-linear note making]] is the practice that feeds it: associative connections rather than administrative categories. [[Normal note-taking fails to connect ideas]] because it organises by subject, and subject-based organisation is optimised for storage, not for the collision that produces new thinking.