"Cave man and Industrial man are both versions of a model of man that is, itself, constantly changed by its own eccentricities -- and their subjective experience of reality is so different that the respective versions follow entirely divergent paths. Cave man did not turn into Industrial man. Nor is Industrial man a better version of an earlier model. Each chose eccentricities that involved specific orientations within the same time-space framework. Each uses the contents of a given earth differently."