In such cases we have an analogous sentiment of unconstrained love for a child, equally free from passion and yearning; but, even putting on one side the maternal relation[224], the expression possesses in no respect the intimacy, the depth of soul, which confront us in Christian paintings. The ancients may very well have painted excellent portraits, but neither their way of conceiving natural fact, nor the point of view from which they regarded human and divine conditions was of the kind that, in the case of painting, an infusion of soul-life could be expressed with such intimate intensity as was possible in Christian painting. The demand of painting, however, for this more personal type of inspiration is a result of its very material. In other words, the sensuous medium in which it moves is an extension on pure surface, and the display of form by means of the use of _diversified_ colours, by virtue of which process the objective shape, as we have it presented to the vision, is converted to an artificial illusion adopted by a spiritual agency[225] in the place of the actual form of fact. It is part of the principle of such a treatment of material that which is external should not ultimately retain its validity in its independent native existence, even in the modified form it takes as a vital product of human hands, but should in this form of realization be lowered as reality to a purely phenomenal reflex of the _inward_ soul-life itself, which seeks to contemplate itself independently as such. When we look into the heart of the matter we shall find that the advance from the rounded form of sculpture amounts to nothing less than the above statement. It is the soul-life, the ideality of Spirit which undertakes to express itself in an intimate way through the counterfeit of the objective world. Add to this, in the second place, that the surface on which the art of painting makes its objects visible, opens independently the path to the employment of a surrounding background and other complex relations; and colour too, regarded as the articulation of that which appears, requires a correspondent differentiation of soul-life, which can only be rendered clearly through the definition of expression, situation, and action, and consequently makes necessary variety, movement, and the detailed exposition of both the inward and external life. This principle of inwardness[226] taken alone, which at the same time in its actual manifestation is associated with the variety of external existence and is cognizable on the face of such particular existence as an essentially complete and independent complex of conditions, we have already seen to be the principle of the romantic type of art, in whose configuration and mode of presentation consequently the medium of painting discovers in a unique way its _wholly adequate object._ Conversely we may affirm at the same time that romantic art, when the question is actually one of definite works of art, must seek for