# exterior (spatial)

the side of a thing that is not inside

- Computed level: L13 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: everyday  ·  Arena: exterior

## Emergence
**Emerges from:** [side](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-side.surface), [boundary](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-boundary.limit), [inside](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-inside.spatial)

**Through:** the side is at the boundary and is not inside

**Novel properties:**
- exteriority
- spatial exclusion
- relative orientation

## Examples
- The International Space Station's exterior hull faces constant micrometeorite erosion in low Earth orbit. *(engineering)*
- Mount Rushmore's exterior surfaces weather from wind and rain, exposing granite to decades of erosion. *(geology)*
- The exterior wall of Notre-Dame Cathedral in Paris shielded the interior during the 2019 fire. *(architecture)*

## Used by
- [screen](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-screen.visual) (L18)

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