Series: The Learn Arc — 50 posts teaching Active Inference through a live BEAM-native workbench. ← Part 7: A Recipe for Designing. This is Part 8. The hero line POMDPs in full colour — message passing, Dirichlet learning, hierarchy. Chapter 7 is the longest chapter in the book, and for good reason. It takes the machinery of Chapters 1–6 and turns the volume on every knob. Planning gets deep