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26Toward an understanding of the differences in the responses of humans and other animals to densityPsychological Review 87 (3): 320-326. 1980.
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77Values as constraints on affordances: Perceiving and acting properlyJournal for the Theory of Social Behaviour 22 (3). 1992.At the bottom of all human activities are “values,” the conviction that some things “ought to be” and others not. Science, however, with its immense interest in mere facts seems to lack all understanding of such‘requiredness.’… A science … which would seriously admit nothing but indifferent facts … could not fail to destroy itself