# Passive
**Trait Number:** 8
**Layer:** Physical
**Bit Position:** 8
**Binary Encoding:** `00000001 00000000 00000000 00000000`
**UHT Code (self-encoding):** `01 00 00 00`
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# Icon
![[Icon8.png|200]]
## Definition
The entity is **inert, non-initiating, or non-active**. It does not produce change or behavior on its own, though it may respond when acted upon.
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## When to Apply
Use this trait when the entity:
- Has **no internal mechanism for autonomous action**
- **Does not emit, transform, or control** on its own
- Is acted upon by external forces but does not initiate them
Avoid applying if the entity:
- Produces **output, behavior, or internal change** independently
- Initiates action, function, or interaction
- Reacts in a way that constitutes **agency, computation, or regulation**
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## Related Traits
- [[10 00 00 00 - Fixed or Static]] — A passive object is often static, but not all static objects are passive (some might store energy or transform under conditions).
- [[00 40 00 00 Emits output or produces effect]] — The absence of this trait often correlates with passivity.
- [[00 02 00 00 Autonomous in function]] — Conceptual opposite: autonomy implies internal drive, while passivity implies total receptivity.
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## Examples
- [[93 00 00 00 - Rock]]
- A resistor (as opposed to an active circuit component)
- A nail in a wall
- A paper sheet
- A sandbox
- A wall (in physical modeling)
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## Commentary
Passivity is a **foundational trait of inertness** — it marks the absence of self-driven action or transformation. Passive entities may still play important roles (e.g., structural, resistive, absorptive), but they do so **without initiating events**.
Note that passivity is not about usefulness — it is about **causal agency**. Something can be extremely important yet completely passive, like a load-bearing beam or a reflective surface.
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