For many years Rudolf Arnheim, known as the leading psychologist of art, has been keeping notebooks in which to jot down observations, ideas, questions, and even (after a stay in Japan for a year) poems in the haiku pattern. Some of these notes found their way into his books--known and prized the world over--such as Art and Visual Perception, Visual Thinking, and The Power of the Center (see list below). Now he has selected,...