even antedates that of Mesopotamia, it must be remembered that the Sumerians who, so far as our present knowledge goes, were the first to introduce the arts of life and all that they bring with them, into the low-lying valley of the Tigris and Euphrates, probably themselves emigrated from the Elamite plateau on the east of the Tigris WE may perhaps further explain the temple-towers, the characteristic feature of most of the religious edifices in Mesopotamia, as a conscious or unconscious imitation in bricks and mortar of the hills and ridges of their native-land, due to an innate aversion to the dead-level monotony of the Babylonian plain, while it is also a significant fact that in the earliest period Shamash the Sun-god is represented with one foot resting on a mountain, or else standing between two mountains.