---
title: "Action Line"
url: "https://erpnext-urs-tqc.v.erpnext.com/dictionary/actionline"
updated: "2026-11-10"
---

## Action Line
## Definition
  The action line is an imaginary line that runs through the main axis of action in a scene. In animation and cinematography, it’s used to keep screen direction consistent so the audience doesn’t get disoriented.
## Context
  For stop-motion, the action line is critical when staging puppets and camera moves. If you cross the line without planning, the puppet may suddenly appear to flip direction on screen. This is part of the 180-degree rule in cinematography.
Related: [[180-degree rule]], [[Screen direction]], [[Composition]], [[Continuity]].
## Examples
Two puppets are talking. If one is facing screen left and the other screen right, the action line runs between them. Crossing it with the camera would make them both appear to face the same way.
In an action scene, a puppet running left to right should stay consistent across shots — unless you intentionally break the line for effect.
## Notes
Breaking the action line can be done creatively — for instance, to show disorientation or chaos.
Beginners often cross the line by accident when shooting inserts or close-ups.
Stop-motion complicates it further: reshoots are difficult, so planning with storyboards and overhead diagrams helps.
## Media
Simple diagram showing the 180-degree rule and the action line between two characters.
Link to a film example where the action line is broken deliberately.
## Tags
  #dictionary #stopmotion #cinematography #composition #continuity