Sensation, which in obedience to its whole nature is concerned with the object and the objective stimulus, also undergoes a considerable modification in the introverted attitude. It, too, has a subjective factor, for beside the object sensed there stands a sensing subject, who contributes his subjective disposition to the objective stimulus. In the introverted attitude sensation is definitely based upon the subjective portion of perception. What is meant by this finds its best illustration in the reproduction of objects in art. When, for instance, several painters undertake to paint one and the same landscape, with a sincere attempt to reproduce it faithfully, each painting will none the less differ from the rest, not merely by virtue of a more or less developed ability, but chiefly because of a different vision; there will even appear in some of the paintings a decided psychic variation, both in general mood and in treatment of colour and form. Such qualities betray a more or less influential cooperation of the subjective factor. The subjective factor of sensation is essentially the same as in the other functions already spoken of. It is an unconscious disposition, which alters the sense-perception at its very source, thus depriving it of the character of a purely objective influence. In this case, sensation is related primarily to the subject, and only secondarily to the object. How extraordinarily strong the subjective factor can be is shown most clearly in art. The ascendancy of the subjective factor occasionally achieves a complete suppression of the mere influence of the object; but none the less sensation remains sensation, although it has come to be a perception of the subjective factor, and the effect of the object has sunk to the level of a mere stimulant. Introverted sensation develops in accordance with this subjective direction. A true sense-perception certainly exists, but it always looks as though objects were not so much forcing their way into the subject in their own right as that the subject were seeing things quite differently, or saw quite other things than the rest of mankind. As a matter of fact, the subject perceives the same things as everybody else, only, he never stops at the purely objective effect, but concerns himself with the subjective perception released by the objective stimulus. Subjective perception differs remarkably from the objective. It is either not found at all in the object, or, at most, merely suggested by it; it can, however, be similar to the sensation of other men, although not immediately derived from the objective behaviour of things. It does not impress one as a mere product of consciousness—it is too genuine for that. But it makes a definite psychic impression, since elements of a higher psychic order are perceptible to it. This order, however, does not coincide with the contents of consciousness. It is concerned with presuppositions, or dispositions of the collective unconscious, with mythological images, with primal possibilities of ideas. The character of significance and meaning clings to subjective perception. It says more than the mere image of the object, though naturally only to him for whom the subjective factor has some meaning. To another, a reproduced subjective impression seems to suffer from the defect of possessing insufficient similarity with the object; it seems, therefore, to have failed in its purpose. Subjective sensation apprehends the background of the physical world rather than its surface. The decisive thing is not the reality of the object, but the reality of the subjective factor, i.e. the primordial images, which in their totality represent a psychic mirror-world. It is a mirror, however, with the peculiar capacity of representing the present contents of consciousness not in their known and customary form but in a certain sense sub specie aeternitatis, somewhat as a million-year old consciousness might see them. Such a consciousness would see the becoming and the passing of things beside their present and momentary existence, and not only that, but at the same time it would also see that Other, which was before their becoming and will be after their passing hence. To this consciousness the present moment is improbable. This is, of course, only a simile, of which, however, I had need to give some sort of illustration of the peculiar nature of introverted sensation. Introverted sensation conveys an image whose effect is not so much to reproduce the object as to throw over it a wrapping whose lustre is derived from age-old subjective experience and the still unborn future event. Thus, mere sense impression develops into the depth of the meaningful, while extraverted sensation seizes only the momentary and manifest existence of things.