"(17.2. 1914) Beyond some bars, out of arm's reach, lies an objective [a banana]; on this side, in the background of t…"

"For adult man with his mechanized methods of solution, proof is sometimes needed, as here, that an action was a real …"

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

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

"I do not deny that objective experience is imbued with acquired meaning in many respects... Probably no experience es…"

"[Thinking] respond to an objective constellation of millions of stimuli by developing, first of all, an organised fie…"

"How ‘real’ it is one feels when trying to form other groups…Most people will never get this other grouping as clear, …"

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

"Our present knowledge of human perception leaves no doubt as to the general form of any theory which is to do justice…"

"At the present time it is of course quite customary for physicists to trespass on chemical ground, for mathematicians…"