# layer (stratum)

a set of windows sharing the same parameter and the same rate of drift

- Computed level: L12 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: window  ·  Arena: emergence

## Emergence
**Emerges from:** [window](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-window.range), [parameter](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-parameter.condition), [drift](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-drift.aimless), [rating](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-rating.evaluation), [sets](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-sets.grouped), [share](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-share.distribution)

**Through:** multiple windows coexist with shared substrate and drift

**Novel properties:**
- uniform evaluation across a group
- shared drift rate within a bounded collection

## Examples
- The OSI model's transport layer manages end-to-end communication in networks like TCP/IP. *(computing)*
- Earth's troposphere sustains weather patterns through consistent temperature gradients and atmospheric mixing. *(geophysics)*
- The Federal Reserve adjusts interest rates quarterly based on inflation metrics, maintaining monetary policy alignment. *(economics)*

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*Canonical: https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-layer.stratum*  
*Structured data: https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-layer.stratum.json*  
*Every definition provably resolves to space, time, energy and pattern.*