# understanding (cognitive)

Holding a model together with its walls. Demonstrated by knowing where something fails.

- Computed level: L15 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: cognitive  ·  Arena: mental

## Emergence
**Emerges from:** [model](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-model.representation), [wall](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-wall.range-end), [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), [hold](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-hold.physical), [know](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-know.cognitive)

**Through:** Maintenance upholds the model within the window bounded by walls, and through holding the model in place, understanding emerges as knowing where it fails.

**Novel properties:**
- cognitive grasp of limits
- integrated model persistence
- failure-aware representation

## Examples
- The Hubble Space Telescope corrected its blurred vision in 1993 after engineers diagnosed spherical aberration in its primary mirror. *(engineering)*
- E. coli bacteria survive pH swings in the gut by regulating internal acidity with proton pumps. *(biology)*
- Python 2.7's end-of-life in 2020 forced developers to migrate, exposing dependencies that broke without updates. *(computing)*

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