And what he saw there was a pattern, he was to explain, a pattern forged by the creative ‘look’ that artists posses as they scan the chaotic rubble of ordinary appearances and, through an extraordinary act of selective seeing, manage to extract a series of intervals, of harmonic relationships between darks and lights, an intuition of that organic intermeshing to which could be affixed the term unity.

Rosalind E Krauss    The Optical Unconscious