# boundary (limit)

The place where a thing ends and what is not the thing begins.

- Computed level: L2 (depth in the emergence graph, not abstraction)
- Status: published  ·  Domain: physics  ·  Arena: E1

## Emergence
**Emerges from:** [space](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-space.extent), [difference](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-difference.relation), [change](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-change.process)

**Through:** Difference located in space: where one pattern stops matching and another begins, marking a shift across space.

**Novel properties:**
- spatial differentiation
- transition threshold
- discontinuity in pattern

## Examples
- The event horizon of black hole Sagittarius A* marks where Earth's observations cease, at 26,000 light-years distance. *(physics)*
- The Great Barrier Reef's outer edge, surveyed at 2,300 kilometers long, separates coral ecosystems from open Pacific waters. *(biology)*
- The Berlin Wall stood from 1961 to 1989, demarcating East and West Berlin at 155 kilometers long. *(institutions)*

## Used by
- [access](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-access.entry) (L5)
- [album](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-album.music) (L6)
- [area](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-area.spatial) (L5)
- [back](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-back.spatial) (L13)
- [band aid](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-band-aid.upkeep) (L16)
- [bar](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-bar.structure) (L10)
- [bay](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-bay.geographic) (L15)
- [bed](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-bed.furniture) (L17)
- [birds eye view](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-birds-eye-view.abstraction) (L18)
- [blind spot](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-blind-spot.model) (L16)
- [box](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-box.container) (L15)
- [case](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-case.container) (L6)
- [cell](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-cell.biological) (L16)
- [center](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-center.location) (L3)
- [centre](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-centre.location) (L3)
- [chapter](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-chapter.section) (L18)
- [coherence](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-coherence.state) (L11)
- [comfortable](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-comfortable.central) (L14)
- [contact](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-contact.physical) (L4)
- [container](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-container.object) (L6)
- [control](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-control.ability) (L4)
- [country](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-country.political) (L11)
- [county](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-county.administrative) (L10)
- [cover](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-cover.object) (L14)
- [defines](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-defines.verb) (L6)
- [district](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-district.administrative) (L7)
- [domain](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-domain.area) (L7)
- [duct tape](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-duct-tape.upkeep) (L16)
- [enter](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-enter.spatial) (L3)
- [entities](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-entities.object) (L4)
- [equilibrium](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-equilibrium.state) (L16)
- [establishes](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-establishes.verb) (L5)
- [estate](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-estate.property) (L6)
- [extent](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-extent.spatial) (L3)
- [exterior](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-exterior.spatial) (L13)
- [flat](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-flat.commonsurfacegeometry) (L15)
- [form](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-form.shape) (L9)
- [free](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-free.unconstrained) (L5)
- [garden](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-garden.planting) (L8)
- [geography](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-geography.spatial) (L11)

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