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"...the context is as important as the plot... the background as important as the foreground ..." Cuarón is a master at world-building, and for him, presenting the word is as important as the characters or the plot. " You create a universe that the character only traverses ", he says while talking about Roma (2018). So then it makes sense that he utilises those looooong dolly shots - that's a very effective way to set context and background. Cuarón says that dolly shots that

The starting point of a script is the character's Dramatic Problem, and the ending point is whether the problem has been changed or not.

The creative action in film, then, takes place in its time dimension, and for this reason the motion picture, though composed of spatial images, is primarily a time form.