“Thus the distinction between physical and mental powers is identified with the need of conscious labour. This distinction does not always take the form of inimical relationships, however. Only where the worker derives no satisfaction from his work, only where the will and the attention must overcome instinctive repugnance, only there begins the Kantian opposition between work and play. This inimical relationship between the senses and reason, between the poetical play of fantasy and the prose of life — a relationship raised by idealist aesthetics to the level of a fatal division of the human spirit — has its foundation in definite forms of production.”