There is one curious class of glazed tiles in which this motive continually reappears. These tiles are thinner than the ordinary brick. Their shape is sometimes square but with their sides slightly concave (Fig. 127), sometimes circular, in the form of a quoit (Fig. 128). In each case similar designs are employed, flowers, palmettes, &c. These are carried out in black upon a white ground and arranged symmetrically about a round hole in the middle of the tile. These things must have been manufactured for some special purpose, and the name of Assurnazirpal, that may be read upon our first fragment (Fig. 127), shows that they belonged to some great work of decoration whose main object was to glorify the name of that sovereign. It has been guessed that they formed centres for a coffered ceiling, and there is nothing to negative the conjecture. The opening in the centre may have been filled with a boss of bronze or silver gilt. As we have already shown, applique work of this kind played a great part in Assyrian decoration; doors were covered with it and there are many signs that both in Chaldaea and Assyria many other surfaces were protected in the same fashion. [Illustration: FIG. 127.--Fragment of a glazed brick. Width 14 inches. British Museum.] [Illustration: FIG. 128.--Fragment of a glazed brick. Diameter 17 inches. British Museum.] After the careful examination of its ruins Taylor came to the conclusion that the upper story of a staged tower at Abou-Sharein had gilt walls. He found a great number of small and very thin gold plates upon the plateau that formed the summit of the building, and with them the gilded nails with which they had been fixed.[383] In his life of _Apollonius of Tyana_, Philostratus gives a description of Babylon that appears taken from authentic sources, and he notices this employment of metal. "The palaces of the King of Babylon are covered with bronze which makes them glitter at a distance; the chambers of the women, the chambers of the men and the porticoes are decorated with silver, with beaten and even with massive gold instead of pictures."[384] Herodotus speaks of the silvered and gilded battlements of Ecbatana[385] and at Khorsabad cedar masts incased in gilded bronze were found,[386] while traces of gold have been found on some crude bricks at Nimroud.[387] Seeing that metal was thus used to cover wide surfaces, and that, as we shall have occasion to show, the forms of sculpture, of furniture, and of the arts allied to them in Mesopotamia, prove that the inhabitants of that region were singularly skilled in the manipulation of metal, whether with the chisel or the hammer, the above conjecture may very well be true; the sheen of the polished surface would be in excellent harmony with the enamelled faience about it.