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Why do editors cut on action in motion pictures?

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Director Steven Spielberg and camera operator Michael Chapman film next to a large mechanical shark on the set of the 1975 movie Jaws. — motion-picture technology Director Steven Spielberg holding the movie camera, assisted by camera operator Michael Chapman, during the filming of *Jaws* (1975).

In motion-picture filmmaking, editors cut on action primarily to maintain visual and narrative continuity. By matching the movement of a character or object across two different shots—such as the motion of an arm in one location flowing into a similar movement elsewhere—the editor effectively masks the transition between shots.12

This technique is a fundamental principle of continuity editing, which aims to create seamless transitions that do not distract or confuse the audience. By aligning these movements, editors ensure that the change in camera angle or perspective feels natural, allowing the viewer to remain immersed in the story without noticing the "seams" of the editing process. Ultimately, cutting on action helps the editor construct a coherent mental map for the audience, facilitating a smooth flow of the narrative.123