# side (surface)

A part of the boundary of a thing.

- Computed level: L3 (depth in the emergence graph, not abstraction)
- Status: published  ·  Domain: physics  ·  Arena: E1

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

**Through:** A boundary divided into parts, each part facing one region of space.

**Novel properties:**
- orientation
- facing

## Examples
- The Moon's near side always faces Earth due to tidal locking from gravitational forces. *(astronomy)*
- The Berlin Wall's western side was covered in graffiti by artists before its fall in 1989. *(history)*
- A microchip's top side contains etched circuitry connecting transistors smaller than a red blood cell. *(engineering)*

## Used by
- [across](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-across.spatial) (L14)
- [back](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-back.spatial) (L13)
- [bay](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-bay.geographic) (L15)
- [collapse](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-collapse.failure) (L14)
- [exterior](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-exterior.spatial) (L13)
- [front](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-front.spatial) (L15)
- [left](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-left.direction) (L16)
- [north](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-north.direction) (L13)
- [page](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-page.sheet) (L16)
- [south](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-south.direction) (L13)
- [surrounded](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-surrounded.enclosed) (L4)
- [top](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-top.upper) (L13)
- [west](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-west.direction) (L15)

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