Operational-logical levels of technical-constructional transformations, described in the present article, are good bases for understanding the most fundamental mechanisms of the highly productive mind. They represent both historical and subject-matter aspects of the creative act as a social-genetical phenomenon. It becomes possible therefore to further develop K. Marx' description of the history of industry as an open book of essentially human powers, i.e. to scientifically represent "human psychology" in dialectical-materialistic terms.