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Abstract at Bottom, Concrete at Top
- The more general, abstract elements are at the bottom of a layered design stack.
- The more specific, concrete elements are built on top, becoming increasingly particular to a domain or application.
Concrete at Bottom Alternate View
- A common view places concrete work at the bottom, with abstractions layered above.
- This contrasts with the previous model, showing abstraction is context-dependent.
Value of Multiple Perspectives
- Different perspectives on abstraction coexist and reveal unique insights.
- We must choose a perspective to solve problems, using multiple views as tools rather than absolute truths.