Research by Westphal-Fitch and Fitch confirms that visual symmetry is valued by humans. They learned that “symmetrical patterns are not only used most frequently in real life . . . [they] are rated as significantly more attractive than are random patterns.”
Gesche Westphal-Fitch and Tecumseh Fitch. “Beauty for the Eye of the Beholder: Plane Pattern Perception and Production.” Psychology of Aesthetics, Creativity, and the Arts, in press.