Unity - Unity implies structure and stability within a composition. It takes the separate elements and creates a whole. Unity differs from the gestalt methods of grouping in that unity refers to the entire composition, not groups within the composition. Unity can be described as the state in which all elements complement each other rather than compete for attention. Unity can be accomplished through the use of color, shape, direction, texture, and motion.
Similar marks create unity through repetition.
Michael Letts. Monument.
Similarity of shape, line, and color create unity.
Balla, Giacomo. Plastic ensemble. 1915.