[323] Besides the obelisk of Shalmaneser II., which is in a marvellous state of preservation, the British Museum possesses three other objects of the same kind. Two of these were made for Assurnazirpal; the third, the most ancient of all, dates from the time of Tiglath Pileser I.; unhappily only fragments of it remain. [324] See also BOTTA, _Monument de Ninive_, vol. i. plate 64. We here find an instance of one of these arched steles erected before a fortress. [325] ?--ED. Sec. 7.--_Decoration._ Mesopotamia was no exception to the general rule that decoration is governed by construction. To take only one example, and that from an art we have already studied, the Egyptian temple was entirely of stone, and its decoration formed a part of the very substance of what we may call the flesh and blood of the edifice. The elements of that rich and brilliant decoration are furnished by those mouldings which make up in vigour what they lack in variety, by the slight relief or the hardly perceptible intaglio of the shadowless figures cut by the sculptor in stone, and covered by the painter with the liveliest colours. This sumptuous decoration, covering every external and internal surface, may no more be detached from it than the skin of an animal may be detached from its muscles. The union is even more intimate in this case, the adherence more complete. So long as the Egyptian walls remain standing, the blocks of limestone, sandstone, or granite of which they are composed, can never be entirely freed from the images, that is, from the expression of the thoughts, cut upon them by the men of forty centuries ago. In Assyria the case was different. There buildings were of brick, each unit being in the vast majority of cases a repetition of its neighbour. In very few instances were the bricks of special shapes, and the buildings in which they were used could only be decorated by attached ornament, similar in principle to the mats and hangings we spread over the floors and walls that we wish to hide. This result they obtained in one of two ways; they either cased their walls in stone, an expensive and laborious process, or they covered them with a decoration of many colours. As soon as stone came into use, it must have offered an irresistible temptation to the chisel of the sculptor and the ornamentist; and so we nearly always find it decorated with carvings. Sometimes, as in the lintel and thresholds described above (Figs. 95 and 96), the motives are purely ornamental. Elsewhere, in the gates of the Assyrian palaces, and in the plinths of the walls that surround their courts and halls, we find both figures in the round and in low relief. In a future chapter we shall attempt to define the style of these works and to determine their merit. For the present we must be content with pointing out the part played by sculpture in the general system of decoration.