# blind (unobserved)

a parameter with no feedback, so it can drift without being held in its window

- Computed level: L15 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: parameter.condition  ·  Arena: system

## Emergence
**Emerges from:** [parameter](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-parameter.condition), [feedback](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-feedback.communication), [drift](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-drift.aimless), [window](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-window.range), [held](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-held.grip)

**Through:** The absence of feedback prevents the parameter from being held, allowing aimless drift beyond the range boundaries.

**Novel properties:**
- unconstrained drift
- loss of boundary enforcement
- unobserved parameter state

## Examples
- The Hubble Space Telescope's primary mirror, polished to the wrong curvature, remained uncorrected for three years after launch due to no in-situ feedback mechanism. *(engineering)*
- In 2008, Iceland’s banking sector collapsed after loan-to-deposit ratios drifted beyond 10:1 with no regulatory feedback loop. *(economics)*
- The Mars Climate Orbiter burned up in the atmosphere because thruster data was in pounds-force while software expected newtons, with no cross-checking. *(computing)*

## Used by
- [the three tiers](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-the-three-tiers.structure) (L19)

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