A system is in equilibrium when the forces constituting it are arranged in such a way as to compensate each other, like the two weights pulling at the arms of a pair of scales.
Rudolf ArnheimOnce it is recognized that productive thinking in any area of cognition is perceptual thinking, the central function of art in general education will become evident.
Rudolf ArnheimSince mechanically obtained randomness contains all kinds of possible permutations, including the most regular ones, it cannot be relied upon always to exhibit a pervasive irregularity.
Rudolf Arnheim