in the west wall is enamelled with tiny flowers on a deep blue meadow. Each part of the design, each plane, each repetition, each separate branch or blossom has its own sombre beauty. But the beauty of the whole comes as you move. Again, the highlights are broken by the play of glazed and unglazed surfaces; so that with every step they rearrange themselves in countless shining patterns... I have never encountered splendour of this kind before. The "peacock" at the centre of the interior side of the dome is one of the unique characteristics of the mosque. If you stand at the entrance gate of the inner hall and look at the center of the dome, a peacock, whose tail is the sunrays coming in from the hole in the ceiling, can be seen. At the interior side of the dome, the aethetic purpose of the long, low, gloomy passage leading to the dome chamber becomes evident, for it is with a sense of heightened anticipation that one enters the sanctuary. Lowness gives way to soaring height and gloom is dispelled by the steady illumination of nearly a score of windows. Barbara Brend described as follows: "the turquoise cable moudling of an arch is seen below the dome, in which concentric rings of thirty-two lozenges diminish in size as they approach a centre which gives an impression of luminosity. The design, which suggests both movement and stillness, is a powerful though not an explicit vehicle of religious symbolism, speaking of the harmony of the universe. ... The support system of dome is illustrated by eight great arches of turquoise tilework in cable form which rise from a low dado to the full height of the wall, four in the position of squinches and four against the side walls; between them are kite-shaped squinches-pendentives. Within the dome, ranks of units of tilework of ogee-mandorla form are set in a lattice of plain brick and diminish in size until they meet a central sunbrust patterned with a tracery of arabesque". The structure of the dome of Lotfollah mosque and that of Blue mosque of Tabriz is believed to be derived from that of Shah Vali mosque of Taft, Yazd. The tiling design of this mosque, as well as that of Shah Mosque and other Persian mosques of even before Safavid period, seems to be not completely symmetrical – particularly, in colours