It is improbable that more nonsense has been written about aesthetics than about anything else: the literature of the subject is not large enough for that. It is certain, however, that about no subject with which I am acquainted has so little been said that is at all to the purpose. The explanation is discoverable. He who would elaborate a plausible theory of aesthetics must possess two qualities - artistic sensibility and a turn for clear thinking. Without sensibility a man can have no aesthetic experience, and, obviously, theories not based on broad and deep aesthetic experience are worthless. Only those for whom art is a constant source of passionate emotion can possess the data from which profitable theories may be deduced; but to deduce profitable theories even from accurate data involves a certain amount of brain-work, and, unfortunately, robust intellects and delicate sensibilities are not inseparable. As often as not, the hardest thinkers have had no aesthetic experience whatever. I have a friend blessed with an intellect as keen as a drill, who, though he takes an interest in aesthetics, has never during a life of almost forty years been guilty of an aesthetic emotion. So, having no faculty for distinguishing a work of art from a handsaw, he is apt to rear up a pyramid of irrefragable argument on the hypothesis that a handsaw is a work of art. [. . .]