We have now established a relation between the æsthetic and the practical activity: the physical expression is an act of the will, and as such it falls legitimately in the domain of both economic and ethical judgments. We may buy or sell the physical stimuli, books, statues, and paintings, though no amount of wealth can give the æsthetic vision: the possession of the objects of art is of another order than the possession of the spiritual creation. We may consider that the communication of a certain intuition is in certain cases morally undesirable, and censure the artist for having willed it, or try to prevent him from accomplishing it. The principle of the spiritual autonomy of art, necessary to establish the nature of æsthetic value, cannot be understood to imply the absolute practical freedom of the artist from the laws that bind all other men. But even from this point of view, there is no doubt that art is more likely to suffer from excessive constraint than from excessive freedom; and that the fanatics of morality in art are only too often inclined to mistake a set of arbitrary rulings for morality, and to overlook the intention of the artist. It is a significant fact, and one which deserves more attention than it seems to have ever received, that the so-called moral condemnation of a true work of art has never outlasted one or two generations, and their prejudices and weaknesses. The existence of the physical stimuli or material helps for the æsthetic reproduction, fosters the illusion of beauty as an intrinsic attribute of physical objects, first as artistic, and then as natural beauty. It is hardly necessary to criticise this illusion at this point of our discussion: beauty is not an objective attribute, but a spiritual value. In the same way as there is no intrinsic beauty, independent dent of our either creative or re-creative activity, in words or notes or lines or colours, there is also no category of natural beauty. What we call beauty of nature is either that which in nature is merely pleasureable from a practical and sensuous standpoint, or the presence of certain stimuli for the reproduction of a preëxistent æsthetic vision. We recognise the obvious truth of this fact, when we remark that the beauty of a certain landscape is not visible to everybody, but only to him who looks at it with an artist's eye. And it would be possible to write a history of the progressive development of beauty in nature, which would practically coincide with, or follow at a short distance of time, the various stages of the history of poetry and painting.