"In art, theme is usually about life, society or human nature, but can be any other subject. Themes are the fundamental and often universal ideas explored ...
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in a work. Themes are usually implied rather than explicitly stated. Deep thematic content is not required in a work, but the great majority of works have some kind of thematic content, not always intended by the author. Analysis of changes (or implied change) in dynamic characteristics of the work can provide insight into a particular theme.
A theme is not the same as the subject of a work. For example, the subject of Star Wars is "the battle for control of the galaxy between the Galactic Empire and the Rebel Alliance". The themes explored in the films might be "moral ambiguity" or "the conflict between technology and nature"." - (en.wikipedia.org 30.12.2020)