Symmetry

within a film when two or more distinct plotlines ‘mirror’ each other or develop variations on the film’s theme or plot; aka mirroring.

The concept of symmetry sounds simple and familiar, yet symmetry is far more complex and difficult to apply in practice than one might think. The visual power of symmetry is so great that filmmakers often avoid or are advised against using symmetrical picture compositions. And this is not so odd, for if symmetry is used randomly and thoughtlessly, one runs the risk of creating visual disturbances in the narrative of the film. On the other hand, the filmmakers who master the art of symmetry wield a powerful visual aid capable of communicating complex meanings that cannot otherwise be conveyed visually.
(Louis Thonsgaard)