In many works of art there is a dominant theme, or motif, which stands out and upon which the other portions are centred. This theme is then varied in different ways in other portions of the work. This is a special case of unity-in-variety. If every line in a work of music or literature were entirely novel and different from the other ones, there would be enormous diversity but no unifying connecting links, and if there were simply a repetition of the initial theme or of entire sections of the work (as sometimes happens when a composer does not know how to develop the thematic material), there would be unity but no variety. Both unity and variety are preserved by having central themes with other material that is related to them (unity) but not identical with them (variety). Development, or evolution
In works of temporal art, each part develops or evolves into the next, each part being necessary to the succeeding part, so that if an earlier part were altered or deleted, all the subsequent parts would have to be altered in consequence. If a portion of Act IV could be interchanged with a portion of Act II without loss of effect, the principle of development has not been observed, for then the material occurring in between would not have made any difference. Balance
The arrangement of the various parts should be balanced, usually in contrasting ways (the adagio movement coming between two faster movements, for example). In painting, there should be a balance between the right and left halves of the canvas. The many ways, other than simple mechanical symmetry (“for every item on the left there should be an item on the right,” which soon becomes monotonous), in which a painting may have variety and yet retain balance are too complex to be discussed other than in a book of art criticism. But in its simplest essentials, the principle is acknowledged by everyone: the person who places all the furniture on one half of the living room while leaving the other half empty finds the arrangement aesthetically displeasing because the room lacks balance.
There are many descriptions of principles of form in art, which differ from one another in their terminology more than in their final outcome. In general, however, few if any of these principles would be denied (only the detail of their formulations might be) by most philosophers of art. Why certain principles of form are found satisfactory and others are not is a fascinating psychological question, leading back to a discussion (necessarily vague in the present state of knowledge) of the nature of the human organism and the discriminatory powers of the human mind. But however obscure the explanation, the facts of the case seem clear enough: certain formal principles in art must be observed, and, to the degree that they are ignored or violated, aesthetic catastrophe occurs: the work of art cannot evoke interest or sustain it long once it is initiated.
Although a discussion of these formal principles is helpful particularly to those who have little native sense of form and who want “to know what to look for” in art, they are sufficiently vague so that many critics can agree on a formal principle, such as unity, and yet disagree on the degree to which a specific work possesses it.
In addition, these principles are far from complete: a work of art can possess unity and the other requirements in high degree and yet be unsuccessful even as form. The requirements listed seem only to have skimmed the surface. Yet what more is required to distinguish a formally correct but dull work of art from a brilliant one seems to defy precise analysis. Moreover, the majority of critics who have assented to these principles are not formalists: they have acknowledged and even insisted on the great importance of form in works of art, but they have not alleged, as formalists do, that these principles constitute the sole criteria of excellence in works of art. They have held that the fulfillment of formal criteria counts as a necessary condition for artistic excellence but not a sufficient condition. Pragmatic theories of art
There are theories of art that differ from one another in what they allege to be the real purpose or function of art but are at one with each other in the belief that art is a means to some end, whether that end be the titillation of the senses or the conversion of humankind to belief in God or the improved moral beliefs or moral tone of the reader or viewer. In every case, the work of art is considered as a means to some end beyond itself, and hence what counts in the final analysis is not the nature of the work of art itself but its effects upon the audience—whether those effects be primarily sensory, cognitive, moral, religious, or social. Hedonistic theories of art
According to one kind of theory, the function of art is to produce just one kind of effect upon its audience: pleasure. It may also inform or instruct, represent or express, but first and foremost it must please. The more pleasure it gives, the better the art.
If the theory is left in this simple form, it yields the result that glossy and superficial works and those containing nothing difficult or obscure are the best works of art. Thus, on the hedonistic account, King Lear might come out far behind Henry Wadsworth Longfellow’s The Song of Hiawatha, or Joyce Kilmer’s “Trees,” in view of the difficulty of comprehending Shakespeare by many people and the pleasant, easy lilting quality of Longfellow’s poem; similarly, a simple ditty might come out ahead of Bach’s Mass in B Minor. True, Shakespeare and Bach might produce more pleasure in the long run since their works have endured through more centuries, but, on the other hand, the simple works can be apprehended and enjoyed by vastly more people.
In any case, the theory has often been amended to read “aesthetic pleasure” rather than simply “pleasure”—thus placing great importance on exactly how the term “aesthetic” is to be defined. The definition of this troublesome term is beyond the scope of this article (see aesthetics); it will simply be said here that no quick and easy way of distinguishing aesthetic pleasures from other pleasures will suffice for the task at hand. If it is said, for example, that aesthetic pleasure consists in satisfaction taken in the contemplation of sensuous particulars (tones, colours, shapes, smells, tastes) for their own sake—that is, for no further end and without ulterior motive—then one confronts the fact that as much pleasure may be taken in single smells and tastes for their own sakes, without any reference beyond them, as may be taken in the most complex works of art. For that matter, pleasure in playing a game (one not played for money) is pleasure in doing something for its own sake, as is the pleasure of robbing a house if it is done not for money but for “kicks.” If something is found pleasurable, ordinarily the pleasure is what one wants from it, not something else beyond it.
Moreover, if it is said that a work of art should be a means toward pleasure, that is treading suspiciously near to the opposed view that art should not be a means to an end but an end in itself. If someone says, “Why do you go jogging every morning for three miles? Because you feel the exercise is good for you?” and another person answers, “No, not that at all, I just enjoy doing it,” this would ordinarily and quite sensibly be taken as saying that the person did not do exercise as a means toward an end but as an end in itself. If something is done just because it is enjoyed, in common parlance this would be taken to be “doing it as an end in itself”; if one objected, “No, I’m not doing it as an end in itself, I’m doing it as a means toward the enjoyment I’ll get out of it,” the reply would be considered sophistical, for doing it for enjoyment’s sake is precisely what is ordinarily meant (or one thing that is ordinarily meant) by the statement that a thing is being done for its own sake.