Based on lectures delivered as The Inaugural Lectures in The Heinz Werner Lecture Series at Clark University (Worcester, Mass.) in January 1966, the book introduces new conceptions of humans and their world. After discussing the advantages and drawbacks of humanity’s propensity for the symbolic construction of reality, it focuses on the systems approach to an understanding of the species. The author warns against the common error of identifying cybernetics with general systems theory. No matter how complex the cybernetic system, it "can always be resolved into feedback circuits" and thought of in terms of "linear causality." The regulative behavior of general systems is determined by goal-directed, dynamic interaction between many forces and variables in an open system. Bertalanffy points out that "no comprehensive theory of systems exists today." As a model, however, the approach has many advantages, such as obviating the need for the "ghost in the machine" and suggesting some solutions to the mind-body problem.