# symbiosis (mutual)

Two systems each holding the other's window open.

- Computed level: L18 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: biology  ·  Arena: living systems

## Emergence
**Emerges from:** [hold](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-hold.physical), [open](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-open.spatial), [system](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-system.organized), [window](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-window.range), [maintenance](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-maintenance.upkeep)

**Through:** Each system physically holds the other's boundary open, maintaining access to the parameter range that allows persistence.

**Novel properties:**
- reciprocal persistence
- mutual accessibility
- sustained co-availability

## Examples
- Coral polyps and zooxanthellae algae maintain photosynthesis and nutrient exchange in Australia's Great Barrier Reef. *(biology)*
- The Internet Archive preserves public web pages daily, enabling access to deleted or altered content. *(computing)*
- The 1955 Austria State Treaty restored sovereignty while guaranteeing minority rights for Slovenes and Hungarians. *(institutions)*

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