From what we have already established, we know how this requirement can be met: by elaborating the outer aspects of the object in the direction of pleasure and expression. By this means the beauty of mere appearance will strike and occupy the mind, inducing the aesthetic attitude towards the outside, from which it may then spread and embrace the inner, purposive meaning. The obviously disinterested and warmly emotional admiration of the shape will prevent the admiration for the purposive adaptation from being cold and abstract. Hence, although from the point of view of utility the beauty of mere appearance may seem to be a superfluity, it is almost indispensable from an aesthetic point of view, since it raises the appreciation of the purpose to the aesthetic plane. And we can understand how enthusiastic workmen, whose admiration for their work is already aesthetic, must necessarily desire to consecrate and communicate this feeling by beautifying the appearance of their products; how inevitably, through the ages, they have made things not only as perfect as they could, but as charming.

When developed for the ends of the aesthetic life, the useful object exhibits, therefore, two levels of beauty: first, that of appearance, of form and sensation, line and shape and color; and second, that of purpose spoken in the form. The first is of the vague and immediate character so well known to us; the second is more definite and less direct, since it depends upon the interpretation of the object in terms of its function. The relation between the two is like that which obtains, in a painting, between color and line, on the one hand, and representation, on the other. When the first level of beauty is richly developed on its own account, it becomes ornament. In a Greek vase, for example, there is a beauty of symmetrical, well-proportioned shape, delicate coloring of surface, and decorative painting, which might be felt by people who knew nothing of its use; and, in addition, for those who have this knowledge, a beauty in the fine balance of parts in the adjustment of clay to its final cause. These factors, which we have distinguished by analysis, should, however, be felt as one in the aesthetic intuition of the object; the form, although beautiful in itself, should reveal the function, and the decoration, no matter how charming, should be appropriate and subordinate. Otherwise, as indeed so often happens, the beauty of one aspect may completely dominate the others; when the object either remains a pretty ornament perhaps, but is functionally dead; or else, if it keep this life, loses its unity in a rivalry of beautiful aspects.

All these points are strikingly illustrated in architecture. The architects claim that their art is a liberal one aiming at beauty, yet most buildings to-day are objects of practical interest alone. Their doors are merely for entrance, their windows for admission of light, their walls for inclosure. Few people, as they hurry in or out of an office building or a railway station, stay to contemplate the majesty of the height or the elegance of the facade; they transact their business, buy their tickets, check their luggage, and go. Even when the building has some claim to beauty, the mood of commercial life stifles observation; or, if the building is observed, there is no strong emotion or vivid play of imagination, no permanent impression of beauty lingering in the memory, no enrichment of the inner life, such as a musical air or a poem affords, but only a transient and fruitless recognition. For this reason many have thought that buildings must become useless, as castles and ruined temples are, in order to be beautiful. Yet, in proportion as this is true, it involves a failure on the part of architecture, a failure to make the useful a part of the beautiful. A building, which was designed to be a habitation of man, when taken apart from the life which it was meant to shelter and sustain, is an abstraction or a vain ornament at best. If the company which peopled it are gone, it can win significance only if we re-create them in the imagination, moving in the halls or worshiping at the altars. We cannot get rid of the practical for the sake of the aesthetic, but must take up the practical into the aesthetic. For this reason architecture has achieved its greatest successes where its uses have been most largely and freely emotional, most closely akin to the brooding spirit of beauty—in religious buildings.

Most buildings, it must be admitted, are not beautiful at all. In order to be beautiful, they should be alive, and alive all over, as a piece of sculpture is alive; there should be no unresponsive surfaces or details; but most of our buildings are dead—dead walls, dead lines, oblong boxes, neat and commodious, but dead. The practical problems which the architect has to solve are so complex and difficult, and the materials which he uses are so refractory, that there is inevitably a sacrifice of the beauty of appearance to utility. The very size of a building makes it aesthetically unmanageable all over. Here the lesser industrial arts, like the goldsmith's, have an advantage in the superior control which the workman can exert over his materials; his work is that of a single mind and hand; it does not require, as architecture does, the cooperation of a crowd of unfeeling artisans. In architecture, mechanical necessities and forms threaten to supplant aesthetic principles and shapes. The heavy square blocks, the rectangular lines, seem the antithesis of life and beauty. "All warmth, all movement, all love is round, or at least oval…. Only the cold, immovable, indifferent, and hateful is straight and square…. Life is round, and death is angular." [Footnote: Ellen Key, The Few and the Many, translated from a quotation in Max Dessoir, Aesthetik und Allgemeine Kunstwissenschaft, page 396.] What vividness of imagination or sentiment can transmute these dead and hollow masses into a life universally felt?

And yet, in a series of works of art among the most magnificent that man possesses, this miracle was achieved. The Greek temples and Gothic cathedrals are so much alive that they seem not to have been made with hands, but to have grown. The straight lines have been modified into delicate curves, the angles have given place to arches, the stiff and mathematical have been molten into movement and surprise, the heaviness has been so nicely balanced or overcome that it has been changed into lightness, with the help of human and animal sculpture and floral carving the inorganic has been transformed into the organic, by means of painting and stained glass even the dull surfaces of walls and windows have been made to glow into life. Artists wrought each portion and detail, and built the whole for the glory of God and the city, a monument for quiet contemplation, not a mere article to be used. With few exceptions, any architectural beauty that we create is but a feeble echo of theirs. Some day we may be able to produce something worthy to be placed by its side, but only when we have sanctified our life with communal aims. The aesthetic effect of a building depends upon many factors, of which only a few can be analyzed by us in this short chapter. If we abstract from its relation to purpose, architecture is fundamentally an art of spatial form. Working freely with it, under the sole limitation of function, the architect can make of this form a complex, various, and beautiful language intelligible to all men, and possessed of a systematic, yet fluent logic. Of this language the simplest element is line. At first view, as we approach a building from the outside, its beauty, as in the case of sculpture, is essentially pictorial. For, although a building is a three-dimensional solid in reality, each view of it is a two-dimensional surface, bounded by lines and divided and diversified within by other lines. Now these lines have their life and beauty like the lines of a picture. How they get this life and what its specific quality is in the case of particular lines, we need not explain again; but no one can fail to feel the upward movement of the vertical lines of the Gothic style, the repose of the horizontal lines of the Renaissance style, the playful grace of the Rococo. Naturally, since the front of a building, where one enters, is the most important and the most constantly in view, its pictorial beauty is elaborated with especial care by the architect. This is the justification of the overshadowing preeminence of the facade in Renaissance palaces, which indeed was oftentimes the only visible part of the outside of the building. When, however, the building is perspicuous all round, it should, like a statue, present a beautiful view from every standpoint.

In architecture, as in painting, the visual elements are adapted to one or the other of the two chief ways of seeing. Either the surfaces are seen as wholes primarily and the details in subordination; or else the parts stand out clear and distinct, and the whole is their summation. The former is always the case when the surfaces are left plain with few divisions, or, if the surfaces are divided, when the lines intersect and intermingle, as is exemplified in late Renaissance or Baroque work, where the walls are covered with lavish ornament, the enframement of windows is broken by moldings and sculpture which carry into the surrounding spaces, and where, instead of embracing one story, the "orders" comprise the entire height of the building. The second possibility is well illustrated by the early classical Renaissance, where the surface of each story, sharply separated from the others by the line of the frieze, is divided regularly by arches or columns, each window clearly enframed, and every sculptured ornament provided with a niche.

There is, however, this fundamental difference between architectural and pictorial lines: the latter are usually pure kinematical lines, lines of free and un-resisted movement, while the former are usually dynamical, lines of force which move against the resistance of mass. In a picture objects are volatilized into light and have lost all weight; but in architecture, since they are present in reality and not in mere semblance, their weight is retained. A Greek column, for example, not only moves upward, but also against the superincumbent load of the entablature which it carries. The difference between the two arts can be appreciated by comparing the picture of a building with the building itself; in the former, despite the fact that we know how heavy the dome or pediment is, and how strong therefore the piers or columns that support it, we hardly feel them as heavy or strong at all—the forces and masses have been transformed into abstract lines and shapes. Sometimes, however, architectural lines and surfaces remain purely kinematical; on the inside of our rooms, for example, when the surfaces are smooth, and especially when they are decorated, we often feel no tension of conflicting forces, but only a quiet play of movements; it is as if the walls had been changed into the paper or paint that covers them. The vividness of the expression of mechanical forces in architecture depends, moreover, upon the kind of materials employed; it is greater in marble than in wood, and less in our modern constructions of steel and glass, where the piers move in single vertical lines from the bottom to the top of the building, than in the old forms, where the upper part of the building is frankly carried by the lower.

The mere expression of mechanical forces in a building would not, however, be aesthetic by itself, no matter how obvious to the mind. We must not only know these forces to be there, we must also feel them as there; we must appreciate them in terms of our own experiences in supporting weights and overcoming resistances. We must transform the mechanical into the vital, the material into the human. Art is an expression of life, not of mathematics. And this translation is not the result of an unusual, artificial attitude assumed for the sake of aesthetic appreciation; it is the natural mode of apperceiving force and mass. We cannot see a column supporting an entablature without feeling that it stands firm to bear the weight, much as we should stand if we were in its place. If this is a "pathetic fallacy," it is one which we all inevitably commit. Even the skeptic, if he were to examine carefully into his own mind, would find that he commits it, whenever he gives to the column, not a casual or merely calculating regard, but a free and earnest attention. If he gives his mind to the column and lets the column take hold of his mind, allowing his psychological mechanism to work unhampered, he will commit it. The aesthetic intuition of force—the human way of appreciating it—is, in fact, primary; the purely mechanical and mathematical is an abstraction, superimposed for practical and scientific purposes.

The interplay of humanized mechanical energies, of which architecture is the expression, may be conceived as the resultant of four chief forces, acting each in a definite direction: upward, downward, outward, and inward. The downward force is associated with the weight of the materials of which the building is constructed. To all physical objects we ascribe a tendency toward the earth. An unsupported weight will fall, and even when supported will exert a pressure downward. And this tendency is no mere directed force in the physical sense, but an impulse, in the personal sense. For when with hand or shoulder we support a weight, we inevitably interpret it in terms of our own voluntary muscular exertion in resisting it; even as we strive to resist it, so it seems to strive to fall. Although this force is exerted downward, it shows itself in the horizontal lines of a building, in string courses, parapets, cornices, friezes; for the horizontal is the line parallel to the earth, toward which the force is directed, and along which we lie when we rest.[Footnote: Compare the discussion of Lipps, Aesthetik, Bd. 1, Dritter Abschnitt, although I am far from accepting all of his analyses.]

Opposed to the downward force is the upward force. If an object does not fall, it must be supported by a force in the upward direction; the hand must exert a force perpendicular to the mass which it carries; the body must hold itself erect in order to bear its own weight. Just so, an architectural member, if it is not to collapse, must raise itself upward. Upward forces are revealed by the vertical lines of a building—the prevailing lines of columns, piers, shafts, pinnacles, towers, spires. We interpret vertical lines as moving upward, partly because the eye moves upward in scanning them, partly because we ourselves move in lines of this general direction in going from the bottom to the top of a building. Even when we are at the top of a building we apprehend its vertical lines as rising rather than as descending, because we ourselves had to rise in order to get there. Converging lines, as of towers and spires, we also interpret in the same way as going to the point of meeting above.