So the subject. By and large, a matter of practical human activity is the whole surrounding reality. However, the degree of inclusion of the objective reality in the objective activity is different at different stages of historical development. Perhaps it would be fair to say that the inclusion of a measure of the material world in human practical activity acts as a sort criterion for the development of both the man and his work. Involvement of the material world in human practice is increasing not only in quantitative but also a qualitative aspect; person pushes the boundaries of his impact on the world is not only the "breadth", covering them all that fills a new region of space, but also the "depth" of material reality, permeating all the finer details of its structure.