THERE is scarcely one of the numerous branches of decorative art which has not at some time or other been applied to the ornamenting of wall-surfaces. It will be convenient to classify the various methods under different heads.
1. Reliefs sculptured in Marble or Stone.— This is the oldest method of wall-decoration, of which numerous examples still exist. The tombs and temples of Egypt are very rich in this kind of mural ornament of various dates, extending over the enormous period of nearly 5000 years. These sculptures are, as a rule, carved in very low relief; in many cases they are “counter-sunk,” that is, the most projecting parts of the figures do not extend beyond the flat surface of the ground. Some unfinished reliefs discovered in the rock-cut tombs of Thebes show the manner in which the sculptor set to work. The plain surface of the stone was marked out by red lines into a number of squares of equal size. The use of this was probably twofold: first, as a guide in enlarging the design from a small drawing, a method still commonly practised; second, to help the artist to draw his figures with just proportions, following the very strict canons which were laid down by the Egyptians. No excessive realism or individuality of style arising from a careful study of the lifemodel was permitted. When the surface had been covered with these squares, the artist drew with a brush dipped in red the outlines of his relief, and then cut round them with his chisel....
When the relief was finished, it was, as a rule, entirely painted over with much minuteness and great variety of colours. More rarely the ground was left the natural tint of the stone or marble, and only the figures and hieroglyphs painted. In the case of sculpture in hard basalt or granite the painting appears often to have been omitted altogether. The utter absence of perspective effects and the severe self-restraint of the sculptors in the matter of composition show a keen sense of artistic fitness in this kind of decoration. That the stern rigidity of these sculptured pictures did not in any way arise from want of skill or observation of nature on the part of the artists is at once apparent when we examine their representations of birds and animals; with the most unerring skill and precision the special characteristics of each creature and species were caught by the ancient Egyptian and reproduced in stone or colour, not literally, but in a half-symbolic way, suggesting exactly those peculiarities of form, plumage, or movement which are the essence and “differentia” of each, all other ideas bearing less directly on the point being carefully eliminated.
The subjects of these great mural sculptures are endless in their variety; almost every possible incident in man’s life here or beyond the grave is reproduced with the closest attention to detail. The tomb of Tih at Sakkarah (about 4500 b.c. ) has some of the finest and earliest specimens of these mural sculptures, especially rich in illustrations of the every-day domestic life and occupations of the Egyptians. The later tombs, as a rule, have sculptures depicting the religious ritual and belief of the people, and the temples combine these hieratic subjects with the history of the reigns and victories of the Egyptian kings.
The above remarks as to style and manner of execution may be applied also to the wall-sculptures from the royal palaces of Nineveh and Babylon, the finest of which are shown by inscriptions to date from the time of Sennacherib to that of Sardanapalus (from 705 to 625 b.c.). These are carved in very low relief with almost gem-like delicacy of detail on enormous slabs of white marble. The sacred subjects, generally representing the king worshipping one of the numerous Assyrian gods, are mostly large, often colossal in scale. The other subjects, illustrating the life and amusements of the king, his prowess in war or hunting, or long processions of prisoners and tribute-bearers coming to do him homage, are generally smaller and in some cases very minute in scale (fig. 1). The arrangement of these reliefs in long horizontal bands, and their reserved conventional treatment are somewhat similar to those of ancient Egypt, but they show a closer attention to anatomical truth and a greater love for strong dramatic effect than any of the Egyptian reliefs. As in the art of Egypt, birds and animals are treated with far greater realism than human figures. The plastic art of no period or country has ever surpassed in skill and life-like truth the Assyrian reliefs of horses, mules, hounds, goats, lions, and many other animals. A relief in the British Museum, representing a lioness wounded by an arrow in her spine and dragging helplessly her paralysed hind legs, affords an example of wonderful truth and pathos. Very remarkable technical skill is shown in all these sculptures by the way in which the sculptors have obtained the utmost amount of effect with the smallest possible amount of relief (see Babylonia, vol. iii. p. 190), in this respect calling strongly to mind a similar peculiarity in the work of the Florentine Donatello.
The palace at Mashita on the hajj road in Moab, built by the Sasanian Chosroes II. (614-627 a.d.), is ornamented on the exterior with very beautiful surface sculpture in stone. The designs of this are of peculiar interest as forming an evident link between Assyrian and Byzantine art, and they are not remotely connected with the decoration on Moslem buildings of comparatively modern date.
Especially in Italy during the Middle Ages a similar treatment of marble in low relief was frequently used for wall-decoration. The most notable example is the beautiful series of reliefs on the west front of Orvieto cathedral, the work of Giovanni P⅛ano and his pupils in the early part of the 14th century. These are small reliefs, illustrative of the Old and New Testaments, of most graceful design and skilful execution. A growth of branching foliage serves to unite and frame the tiers of subjects.
Of a widely different class, but of considerable importance in the history of mural decoration, are the very beautiful reliefs, sculptured in stone and marble, with which Moslem buildings in many parts of the world are ornamented. These are mostly geometrical patterns of great intricacy and beauty, which cover large surfaces, frequently broken up into panels by bands of more flowing ornament or Arabic inscriptions. The mosques of Cairo, India, and Persia, and the domestic Moslem buildings of Spain are extremely rich in this magnificent method of decoration. In western Europe, especially during the 15 th century, stone panelled-work with rich tracery formed a large part of the scheme of decoration in all the more splendid buildings. Akin to this, though without actual relief, is the very sumptuous stone tracery,—inlaid flush into rough flint walls,—which was a mode of ornament largely used for enriching the exteriors of churches in the counties of Norfolk and Suffolk. It is almost peculiar to that district, and is an admirable example of the skill and taste with which the mediaeval builders adapted their method of ornamentation to the materials which came naturally to hand.
2. Marble Veneer.— Another widely-used method of mural decoration has been the application of thin marble linings to wall-surfaces, the decorative effect being produced by the natural beauty of the marble itself and not by sculptured reliefs. One of the oldest buildings in the world, the so-called “Temple of the Sphinx” among the Gizeh pyramids, is built of great blocks of granite, the inside of the rooms being lined with slabs of beautiful semi-transparent African alabaster about 3 inches thick. In the 1st century very thin veneers of richly-coloured marbles were largely used by the Romans to decorate brick and stone walls. Pliny (7/. N., xxxvi. 6) speaks of this practice as being a new and degenerate invention in his time. Many examples exist at Pompeii and in other Roman buildings. Numerous Byzantine churches, such as St Saviour’s at Constantinople, and St George’s, Thessalonica, have the lower part of the internal walls richly ornamented in this way. It was commonly used to form a dado, the upper part of the building being covered with mosaic. The cathedral of Monreale and other Siculo-Norman buildings owe a great deal of their splendour to these linings of richly-variegated marbles. In most cases the main surface is of light-coloured marble or alabaster, inlaid bands of darker tint or coloured mosaic being used to divide the surface into panels. The peculiar Italian-Gothic of northern and central Italy during the 14th and 15th centuries, and at Venice some centuries earlier, relied greatly for its effects on this treatment of marble. St Mark’s at Venice and the cathedral of Florence are magnificent examples of this work used externally. It is in every case a mere skin, and is in no way connected with the stability of the structure. Both inside and out most of the richest examples of Moslem architecture owe much to this method of decoration; the mosques and palaces of India and Persia are in many cases completely lined with the most lustrous and brilliant sorts of marble, of contrasting tints arranged and fitted together with consummate skill and knowledge of harmony.
3. Wall-Linings of Glazed Bricks or Tiles.— This is a very important class of decoration, and from its almost imperishable nature, its richness of colour, and its brilliance of surface is capable of producing a splendour of effect that can only be rivalled by glass mosaics. In the less important form—that of bricks modelled or stamped in relief with figures and inscriptions, and then coated with a brilliant colour in siliceous enamel—it was largely used by the ancient Egyptians and Assyrians as well as by the later Sasanians of Persia. In the 11th and 12th centuries the Moslems of Persia brought this art to great perfection, and used it on a large scale, chiefly, though not invariably, for internal walls. The main surfaces were covered by thick earthenware tiles, overlaid with a white enamel. These were not rectangular, but of various shapes, mostly some form of a star, arranged so as to fit closely together. Very delicate and minute patterns were then painted on the tiles, after the first firing, in a copper-like colour with strong metallic lustre, produced by the deoxidization of a metallic salt in the process of the second firing. Bands and friezes with Arabic inscriptions, modelled boldly in high relief, were used to break up the monotony of the surface. In these, as a rule, the projecting letters were painted blue, and the flat ground enriched with very minute patterns in the lustre-colour. This combination of bold relief and delicate painting produces great vigour and richness of effect, equally telling whether viewed in the mass or closely examined tile by tile. In the 15th century lustre-colours, though still largely employed fσr plates, vases, and other vessels, especially in Spain, were but little used for tiles; and another class of ware, rich in the variety and brilliance of its colours, was extensively used by Moslem builders all over the Mohammedan world. The most sumptuous sorts of tiles used for wall coverings are those of the so-called “Rhodian” and Damascus wares, the work of Persian potters at many places. Those made at Rhodes are coarsely executed in comparison with the produce of the older potteries at Ispahan and Damascus (see Pottery). These are rectangular tiles of earthenware, covered with a white “slip” and painted in the most brilliant colours with slightly conventionalized representations of various flowers, especially the rose, the hyacinth, and the carnation. The red used is a very rich harmonious colour, applied in considerable body, so as to stand out in slight relief. Another class of design is more geometrical, forming regular repeats; but the most beautiful compositions are those in which the natural growth of trees and flowers is imitated, the branches and blossoms spreading freely over a large surface covered by hundreds of tiles without any repetition. One of the finest examples is the “Mecca wall” in the mosque of Ibrâhîm Agha, Cairo; and other Egyptian mosques are adorned in the same magnificent way (fig. 2). Another variety, the special production of Damascus, has the design almost entirely executed iι. blue. It was about the year 1600 a.d., in the reign of Shah Abbas I., that this class of pottery was brought to greatest perfection, and it is in Persia that the most magnificent examples of its use are to be found. Nothing can surpass the splendour of effect produced by these tilecoverings, varieties of which, dating from the 12th to the 17th centuries, were largely used in all the chief buildings of Persia. The most remarkable examples for beauty of design and extent of surface covered by these tiles are the mosque at Tabriz, built by Ali Khoja in the 12th century, the ruined tomb of Sultan Khodabend (1303- 1316 a.d.) at Sultanieh, the palace of Shah Abbas I. and the tomb of Abbas II. (ob. 1666 a.d.) at Ispahan, all of which buildings are covered almost entirely inside and out with this magnificent sort of decoration.
Another important class of wall-tiles are those manufactured by the Spanish Moors, called “azulejos,” especially during the 14th century. These are in a very different style, being designed to suggest or imitate mosaic. They have intricate interlacing geometrical patterns marked out by lines in slight relief; brilliant enamel colours were then burned into the tile, the projecting lines forming boundaries for the pigments. A very rich effect is produced by this combination of relief and colour. They are mainly used for dados about 4 feet high, often surmounted by a band of tiles with painted inscriptions. The Alhambra and Generalife palaces at Granada, begun in the 13th century, but mainly built and decorated by Yùsuf I. and Mohammed V. (1333-1391 a.d.), and the Alcazar at Seville have the most beautiful examples of these “azulejos.” The latter building chiefly owes its decorations to Pedro the Cruel (1364 a.d.), who employed Moorish workmen for its tile-coverings and other ornaments. Many other buildings in southern Spain are enriched in the same way, some as late as the 16th century.
Almost peculiar to Spain are a variety of wall-tile the work of Italians in the 16th and 17th centuries. These are effective, though rather coarsely painted, and have a rich yellow as the predominant colour. The Casa de Pilatos and Isabel’s chapel in the Alcazar palace, both at Seville, have the best specimens of these, dating about the year 1500. In other Western countries tiles have been used more for pavements than for wall-decoration.
4. Wall-Coverings of Hard Stucco, frequently enriched with Reliefs.— The Greeks and Romans possessed the secret of making a very beautiful hard kind of stucco, creamy in colour, and capable of receiving a polish like that of marble; it would stand exposure to the weather. Those of the early Greek temples which were built, not of marble, but of stone, such as the Doric temples at Aegina, Phigaleia, Paestum, and Agrigentum, were all entirely coated inside and out with this beautiful material—itself pleasant both in texture and hue, and an admirable surface for the further polychromatic decoration with which all Greek buildings seem to have been ornamented. Another highly artistic use of stucco among the Greeks and Romans for the interiors of buildings consisted in covering the walls and vaults with a smooth coat, on which while still wet the outlines of figures, groups, and other ornaments were sketched with a point; more stucco was then applied in lumps and rapidly modelled into delicate reliefs before it had time to set. Some tombs in Magna Graecia of the 4th century b.c. are decorated in this way with figures of nymphs, cupids, animals, and wreaths, all of which are models of grace and elegance, both in form and action, and extremely remarkable for the dexterous way in which a few rapid touches of the modelling tool or thumb have produced a work of the highest artistic beauty and spirit (fig. 3). Roman specimens of this sort of decoration are very common, fine examples have been found in the baths of Titus and numerous tombs near Rome, as well as in many of the houses of Pompeii. These are mostly executed with great skill and frequently with good taste, though in some cases, especially at Pompeii, elaborate architectural compositions with awkward attempts at effects of violent perspective, modelled in slight relief on flat wall-surfaces, produce a very unpleasing effect. Other Pompeian examples, where the surface is divided into flat panels, each containing a figure or group, have great merit for their delicate richness of effect, without offending against the canons of wall - decoration, one of the first conditions of which is that no attempt should be made to disguise the fact of its being a solid wall and a flat surface.
The Moslem architects of the Middle Ages, who excelled in almost all possible methods of mural decoration, made great use of stucco ornament in the most elaborate and magnificent way, both for external and internal walls. The stucco is modelled in high or low relief in great variety of geometrical patterns, of wonderful beauty and richness, alternating with bands of more flowing ornament, or long Arabic inscriptions. Many of their buildings, such as the mosque of Tuhin at Cairo (879 a,d.), owe nearly all their beauty to this fine stucco work, the purely architectural shell of the structure being often quite simple and devoid of ornament. These stucco reliefs were, as a rule, further decorated with delicate painting in gold and colours, producing an effect of indescribable beauty and splendour. The Moorish tower at Segovia in Spain is a good example of this class of ornament used externally. With the exception of a few bands of brick and the stone quoins at the angles, the whole exterior of the tower is covered with a network of stucco reliefs in simple geometrical patterns. The Alhambra at Granada and the Alcazar at Seville have the richest examples of this work, both in the delicate intricacy of the designs and in the brilliant colours with which they are painted. The lower part of the walls is lined with marble or tiles to a height of about 4 feet, and above that in many cases the whole surface is encrusted with these reliefs, the varied surface of which, by producing endless gradations of shadow, takes away any possible harshness or over-gaudiness from the brilliance of the gold and colours (fig. 4).
During the 16th century, and even earlier, stucco wall-reliefs were used with considerable skill and decorative effect in Italy, England, and other Western countries. Perhaps the most graceful examples are the reliefs with which Vasari in the 16th century encrusted pillars and other parts of the court in the Florentine Palazzo Vecchio, built of plain stone by Michelozzi in 1454. These are very beautiful reliefs, some of flowing vines and other plants winding spirally round the columns. The English examples of this work are very effectively designed, though coarser in execution. The outside of an old half-timbered house in the market-place at Newark-upon-Trent has high reliefs in stucco of canopied figures, dating from the end of the 15th century. The counties of Essex and Suffolk are very rich in examples of this work used externally; and many 16th-century houses in England have fine internal stucco decoration, especially Hardwicke Hall (Derbyshire), one of the rooms of which has the upper part of the wall enriched with life-sized stucco figures in high relief, forming a deep frieze all round. The best English stucco work of this sort is very remarkable for its freedom and spirit of design, as well as for certain grace of line, which is a survival of the old mediaeval sense of beauty, then rapidly passing away.
5. Sgraffito.— This is a variety of stucco work used chiefly in Italy from the 16th century downwards, and employed only for exteriors of buildings, especially the palaces of Tuscany and northern Italy. The process is this. The wall is covered with a coat of stucco made black by an admixture of charcoal; over this a second very thin coat of white stucco is laid. When it is all hard the design is produced by cutting and scratching away the white skin, so as to show the black under-coat. Thus the drawing appears in black on a white ground. This work is effective at a distance, as it requires a bold style of handling, in which the shadows are indicated by cross-hatched lines more or less near together. Flowing arabesques mixed with grotesque figures occur most frequently in sgraffito. It is still largely practised in northern Italy, and has been used with success in the external decoration of the South Kensington Academy of Music.
6. Stamped Leather.— This was...