The combination of compositional and conceptual unity is what

Compositional-

-An artist creates compositional unity by organizing all the visual aspects of a work
-Too much similarity of shape, color, line, or any single element or principle of art can be monotonous and make us lose interest
-Too much variety can lead to a lack of structure and the absence of a central idea

conceptual-

-Conceptual unity refers to the cohesive expression of ideas within a work of art
-The expression of ideas may not look organized, butan artist can still communicate them effectively by selecting images that conjure up a single notion
-Artists bring their own intentions, experiences, and reactions to their work. These ideas—conscious and unconscious—can also contribute to the conceptualunity of a work

A  documentary film  is a nonfictional motion picture intended to document some aspect of reality, primarily for the purposes of instruction, education, or maintaining a historical record.example:     20,000 days on earth