# touch (together)

When there is no space between the boundaries of two things, and each can change the other.

- Computed level: L3 (depth in the emergence graph, not abstraction)
- Status: published  ·  Domain: physics  ·  Arena: E1

## Emergence
**Emerges from:** [space](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-space.extent), [boundary](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-boundary.limit), [interaction](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-interaction.process), [change](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-change.process)

**Through:** The meeting of two boundaries in space enables mutual change, allowing energy or influence to pass between the things.

**Novel properties:**
- mutual change
- contact-mediated interaction
- spatial continuity

## Examples
- Two drops of mercury coalesce on a glass slide, instantly reshaping each other into a single sphere. *(physics)*
- The human fingertip touches a hot stove, and both skin cells and nerve signals change in response. *(biology)*
- Welding two steel beams in the Eiffel Tower frame fuses their surfaces into a single structural boundary. *(engineering)*

## Used by
- [beach](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-beach.geographic) (L15)
- [click](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-click.mechanical) (L4)
- [contact](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-contact.physical) (L4)
- [cross](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-cross.symbol) (L13)
- [feel](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-feel.sensory) (L11)
- [golf](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-golf.sport) (L15)
- [hand](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-hand.part) (L17)
- [held](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-held.grip) (L5)
- [hold](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-hold.physical) (L13)
- [interacting](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-interacting.social) (L4)
- [people](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-people.social) (L6)
- [plug](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-plug.electrical) (L8)
- [port](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-port.harbor) (L15)
- [search](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-search.action) (L4)
- [support](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-support.assistance) (L6)
- [surface](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-surface.exterior) (L4)
- [upon](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-upon.spatial) (L13)
- [web](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-web.structure) (L4)

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