The chapter titles of The hidden structure of a square . It is the attitude of the scientist and the engineer or of the salesman who estimates the size of a customer’s waist, the shade of a lipstick, the weight of a suitcase. Flexible striving Arnheim made another contribution to our thinking about art, one that I think is rarely recognized.
The face of a person is more readily perceived and remembered as being alert, tense, concentrated rather than being triangularly shaped, having slanted eyebrows, straight lips, and so on ( (1933).
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Arnheim’s principal achievement in art theory was to integrate the Gestalt theory of perception with the traditional concerns of picture-making.
But if I sit in front of a fireplace and watch the flames, I do not normally register certain shades of red, various degrees of brightness, geometrically defined shapes moving at such and such a speed.