From a hopelessly optimistic Socialist speech, a kernel of the Arts and Crafts movement I believe to be wholly true:
I think that to all living things there is a pleasure in the exercise of their energies, and that even beasts rejoice in being lithe and swift and strong. But a man at work, making something which he feels will exist because he is working at it and wills it, is exercising the energies of his mind and soul as well as of his body. Memory and imagination help him as he works. Not only his own thoughts, but the thoughts of the men of past ages guide his hands; and, as a part of the human race, he creates. If we work thus we shall be men, and our days will be happy and eventful.
William Morris, Useful Work versus Useless Toil, 1883.