"Regimented minds cannot grasp the concept of confrontation as an open exchange of major differences with a view to settlement through genuine dialogue."

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A work based only on a line concept is scarcely more than a illustration; it fails to achieve pictorial structure. Pictorial structure is based on a plane concept. The line originates in the meeting of two planes ... we can lose ourselves in a multitude of lines, if through them we lose our senses for the planes.

— Hans Hofmann