Subjects, normally exist in Balance or even Fill the Frame.  But here the subject of the photo is small, usually a person, thrown into contrast with a large background.  This idea is closely related to Scale, in which the subject is the large background.

See also how expert photgraphers portray Break the Rules: Small Subjects.
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Boy Scout Troop 174, Yorktown, NY.  Scouting Photography Pages at  http://troop174.info