# constraint (limiting)

A wall placed deliberately, narrowing a window to keep drift inside it.

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

## Emergence
**Emerges from:** [parameter](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-parameter.condition), [window](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-window.range), [wall](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-wall.range-end), [drift](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-drift.aimless), [narrow](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-narrow.spatial), [inside](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-inside.spatial), [keep](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-keep.maintenance), [space](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-space.extent)

**Through:** A wall.range-end acts on a window.range by making it smaller through narrow.spatial, in order to contain drift.aimless within bounds.

**Novel properties:**
- bounded drift containment
- deliberate spatial restriction
- persistent parameter confinement

## Examples
- The International Space Station maintains 22 psi air pressure using electrolysis and resupply missions. *(engineering)*
- The 1996 EU Data Protection Directive limited data transfers to countries with adequate privacy laws. *(institutions)*
- A 2020 Nvidia GPU limits memory bandwidth to 600 GB/s, shaping AI model training speeds. *(computing)*

## Used by
- [grip](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-grip.constraint) (L13)

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