In films, the star is often replaced by a double in many situations, either because the task involved is too dangerous to risk injury or the star simply cannot or will not do what the role requires. We in the audience almost never notice the switching back and forth. One might think that this is solely due to the care that the film makers take to make sure the double has the same build as the star and is made up to have the same exterior appearance in terms of clothes and hair, and by avoiding close ups of the face.
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