# case (container)

A piece that bounds something and keeps it inside.

- Computed level: L6 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: syntactic  ·  Arena: case

## Emergence
**Emerges from:** [piece](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-piece.portion), [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), [keep](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-keep.maintenance)

**Through:** The piece establishes a bounded limit and the boundary defines an edge, together creating a spatial inside where something is kept.

**Novel properties:**
- enclosed interior
- containment function
- persistent placement

## Examples
- The Fukushima Daiichi reactor containment vessel held radioactive material during the 2011 meltdown, preventing total release. *(engineering)*
- A USB flash drive's plastic shell protects the internal circuit board from physical damage and moisture. *(computing)*
- The Liberty Bell's steel alloy casing has contained its fracture since 1846, preserving its iconic crack. *(institutions)*

## Used by
- [box](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-box.container) (L15)

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