He who enters a picture-gallery, or who reads a series of poems, may, after he has looked and read, go further: he may seek out the relations of the things there expressed. Thus those pictures and compositions, each of which is an individual inexpressible by logic, are resolved into universals and abstractions, such as _costumes, landscapes, portraits, domestic life, battles, animals, flowers, fruit, seascapes, lakes, deserts, tragic, comic, piteous, cruel, lyrical, epic, dramatic, knightly, idyllic facts_, and the like. They are often also resolved into merely quantitative categories, such as _little picture, picture, statuette, group, madrigal, song, sonnet, garland of sonnets, poetry, poem, story, romance_, and the like. When we think the concept _domestic life_, or _knighthood_, or _idyll_, or _cruelty_, or any other quantitative concept, the individual expressive fact from which we started is abandoned. From aesthetes that we were, we have been changed into logicians; from contemplators of expression, into reasoners. Certainly no objection can be made to such a process. In what other way could science be born, which, if aesthetic expressions be assumed in it, yet has for function to go beyond them? The logical or scientific form, as such, excludes the aesthetic form. He who begins to think scientifically has already ceased to contemplate aesthetically; although his thought will assume of necessity in its turn an aesthetic form, as has already been said, and as it would be superfluous to repeat. The error begins when we try to deduce the expression from the concept, and to find in the thing substituting the laws of the thing substituted; when the difference between the second and the first step has not been observed, and when, in consequence, we declare that we are standing on the first step, when we are really standing on the second. This error is known as _the theory of artistic and literary classes_. What is the aesthetic form of domestic life, of knighthood, of the idyll, of cruelty, and so forth? How should these contents be _represented_? Such is the absurd problem implied in the theory of artistic and literary classes. It is in this that consists all search after laws or rules of styles. Domestic life, knighthood, idyll, cruelty, and the like, are not impressions, but concepts. They are not contents, but logico-aesthetic forms. You cannot express the form, for it is already itself expression. And what are the words cruelty, idyll, knighthood, domestic life, and so on, but the expression of those concepts?