sensuous appearance, whose visibility is converted into the mere _show_ by art, and on the other in _colour_ by means of the distinctions, transitions, and modulations of which this transformation is effected. The art of painting, consequently, in order to express the soul in its ideality, resolves the three dimensions of space into that of superficies as that which most intimately asserts the ideality of what is external, and represents spatial distance and form by means of the phenomena of colour. For painting is not concerned with producing mere visibility in its general significance, but with that form of visibility which, if it is ideally produced, is also quite as much essentially particularized. In sculpture and the art of building forms are visible by means of external light. In the art of painting, on the contrary, the material which is itself essentially obscure possesses intrinsically within itself its inward or ideal, light in short. It is itself transfused in its own medium, and mere light is to that extent essentially obscured. The unity, however, and blending of light and dark is colour[26]. _Secondly_, the art of _music_ offers a contrast to that of painting in one and the same sphere as the latter. Its real element is the ideal realm as such, emotion in its formless independence, capable of asserting itself not in externality and its reality, but purely through the external medium which disappears immediately when it is expressed and thereby cancels itself. Its _content_ consequently consists of the internal life of Spirit in its immediate, essential subjective unity, emotion simply; its _material_ is musical tone, its form and configuration, the concord, discord, harmony, contrast, opposition, and resolution of such tones according to the laws of their quantitative intervals respectively and their artistically elaborated time measure.