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More Is Different
Systems / Principles
At sufficient scale, new properties emerge that don't exist in the parts.
The Idea
Philip Anderson's essay title: more is different. A single water molecule isn't wet. Wetness emerges from many molecules together. A neuron doesn't think; a brain does. Emergent properties don't live in the parts — they appear only in the whole.
Why It Matters
- Reducing a system to its parts loses the emergent behaviours that define it.
- Scaling changes systems qualitatively, not just quantitatively.
- What worked at ten employees may be impossible at a thousand.
How to Apply
- Expect new behaviours at each scale transition.
- Rebuild processes at scale thresholds, don't just stretch old ones.
- Look for emergent opportunities, not just emergent problems.
Examples
- Tens of users: you know each one. Millions: you model them.
- A team: individual judgement. An org: culture and process.
- A codebase: a few files vs a million lines.
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