Both art and science are bent on the understanding of the forces that shape existence, and both call for a dedication to what is. Neither of them can tolerate capricious subjectivity because both are subject to their criteria of truth. Both require precision, order, and discipline because no comprehensible statement can be made without these. Both accept the sensory world as what the Middle Ages called signatura regrum, the signature of things, but in quite different ways.
Rudolf Arnheim (1904-2007) in Visual Thinking, pg. 300-301 — a German-born author, art theorist, and gestalt psychologist.