Where Things Get Interesting We've built a complete picture: Fields (F) define domains with specific rules. Scales (λ) determine context within those domains. Quanta (Q) are what appears when you observe a field at a scale. Measurability (M) constrains what can appear. The equation Q=Fλ, Q⊆M generates valid frameworks. And this stratification continues infinitely; no ground floor, no ultimate emergence, scales within scales forever. But if reality is structured this way, the most important question becomes: where do the boundaries lie? Boundaries are where one field gives way to another. Where one scale regime transitions to a different regime. Where the measurable space changes. Where frameworks that worked perfectly well suddenly break down. Boundaries are where theories fail, where paradoxes emerge, where the most interesting phenomena occur. Understanding boundaries is understanding the architecture of reality itself. This chapter shows you how to recognize them, what happens...