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In page Formalist film theory:

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A formalist considers the synthesis of several elements, such as editing, shot composition, and music. The shoot-out that ends Sergio Leone's Spaghetti Western Dollars Trilogy is an example of how these elements work together to produce a formalist effect: the shot selection goes from very wide to very close and tense; the length of shots decreases as the sequence progresses towards its end; the music builds. All of these elements, in combination rather than individually, create tension.[citation needed]