Wolfgang Köhler

"It is hardly an exaggeration to say that a chimpanzee kept in solitude is not a real chimpanzee at all."

"At the present time it is of course quite customary for physicists to trespass on chemical ground, for mathematicians to do excellent work in physics, and for physicists to develop new mathematical pr…"

"Our present knowledge of human perception leaves no doubt as to the general form of any theory which is to do justice to such knowledge: a theory of perception must be a field theory. By this we mean …"

"Physics is becoming the study of organization. In this way ... it will converge with biology and psychology."

"If we wish to imitate the physical sciences, we must not imitate them in their contemporary, most developed form; we must imitate them in their historical youth, when their state of development was co…"

"At a given time some concrete forms are simply there in vision, not less than colors and brightnesses."

"For the most part similarities of various degrees will occur in one perceptual situation; and then specific perceptual units will be formed not simply because their members resemble each other, but be…"

"respond to an objective constellation of millions of stimuli by developing, first of all, an organised field, many and perhaps the most essential properties of which have no physical partner among the…"