Every person operates from an axiom stack—a layered architecture of bedrock presuppositions, inquiry algorithms, and worldview outputs. This chapter makes that invisible structure visible, lays out three major examples (Scientific-Existentialist, Scriptural-Theist, and Dharmic/Taoist), and introduces the concepts of entailment costs, incommensurability, and sovereign choice. The foundation for understanding why intelligent people looking at the same world can reach radically