Robert Mangold (b. 1937)

Mangold's flat, front art contains so many asymmetrical surprises that you would think it odd to discover rules to account for them. Indeed, his rules are entirely flexible and come only after the fact, with his experience of having generated the forms that characterize the specific sizes. He doesn't establish inviolable principles.
-R. Shiff in "A Compelling Uniqueness," Robert Mangold, Aspen, 2003, p. 27.