How do I practice cognitive categorization?

The most direct way to practice cognitive categorization is through a focused exercise: Pick a system you use to organize something — your notes app, your email folders, your bookmarks, your task board. List every top-level category. Now ask: what is absent? What dimension of reality has no folder, no tag, no label? The things you never created categories for are the things your system has been silently telling you don't matter. Write down three missing categories and ask whether that absence is a deliberate choice or an inherited blind spot.

Common pitfall: Treating your categories as neutral descriptions of reality rather than as value-laden choices. You'll know you've fallen into this when you can't imagine organizing the same material differently — when the categories feel inevitable rather than chosen. The moment classification feels obvious is the moment it's most invisible, and invisible classification is where unexamined values do their most powerful work.

This practice connects to Phase 12 (Classification and Typing) — building it as a repeatable habit compounds over time.