Engineering organizations can't keep redefining foundations. Teams change, products evolve, stacks shift—but you need stable abstractions everyone relies on. The well principle: build the source right once, let everyone draw indefinitely. Shannon's information theory is the platonic ideal. Seventy-five years later, every compression codec, error-correction scheme, channel capacity calculation draws from those 1948 equations. No bugs in Shannon's math. The well was built right. In your codebase, the well is your foundational library. Core abstractions that don't thrash quarterly. When designing these layers, you're digging a well your team will draw from daily. The text warns: if the rope doesn't reach the water, misfortune. Beautiful abstractions that are too hard to access fail. Shannon made theorems usable—elegant equations, clear notation, practical examples. Interface matters as much as depth. If the jug breaks, misfortune. When foundational layers fail (broken error-handling, violated API contracts, memory leaks), everyone depending on them fails. Integrity isn't optional. You can change the village but not the well. Products pivot, teams reorganize, companies get acquired. But core protocols, fundamental data structures, essential algorithms—these stay stable. Shannon published in 1948; telecom engineers in 2025 still reference the same theorems. What people miss: the well isn't static, it's maintained. Shannon's framework is stable, but implementations improve (LDPC codes, turbo codes, modern compression—all within Shannon's bounds). Your core library should be stable, not frozen. Bug fixes and better interfaces are valid. Essential abstractions shouldn't thrash. Identify what in your system should be a well. What abstraction is fundamental enough to remain stable while everything else changes? What's your Shannon entropy formula—the core insight everyone will reference for the next decade? Build that layer with Shannon's care. Make it correct, accessible, inexhaustible. Let your team draw from it daily without worry. The well serves because it's reliably there.