# Knowledge Graph (/en/docs/graph)



Café OS has exactly one body of knowledge. Every concept has a stable id; chapters, 3D scenes and real labs reference that id instead of restating it.

Concepts relate in six ways: **causes**, **affects**, **depends on**, **measured by**, **contrasts with** and **precedes**. The table lists each concept's direct upstream and downstream.

<ConceptGraph />

The graph records direction, not magnitude. "Finer grind → faster extraction" is a direction; "how much finer, how much faster" belongs to the simulation models and is labelled as an approximation.