Vertical and horizontal lines are the expression of two opposing forces; they exist everywhere and dominate everything; their reciprocal action constitutes 'life'. I recognized that the equilibrium of any particular aspect of nature rests on the equivalence of its opposites.
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Source, in full
Quote in 'Plastic Art and Pure Plastic Art', Piet Mondrian (1937), in 'Documents of modern Art', for Wittenborn, New York 1945, p. 13; as quoted in Abstract Expressionist Painting in America, W.C, Seitz, Cambridge Massachusetts, 1983, p. 55