Core concepts that appear across 8+ books. These are the highest-signal ideas in the library — the building blocks that multiple authors independently validate.

Established concepts appearing in 4-7 books. Well-documented ideas with strong cross-referencing — actively growing as new books are processed.

Emerging concepts found in 1-3 books so far. These may grow into foundational ideas as more books are added to the library.

Non-obvious structural parallels between books across different fields — isomorphic systems, metaphorical bridges, convergent conclusions, and inversions that reveal hidden patterns.