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.
Boy Scout Troop 174, Yorktown, NY. Scouting Photography Pages at http://troop174.info