But this is only a first glimpse from a city set among green fields; and is concerned rather with what the desert has been in its relation to men than with what the desert is in itself. When the mind has grown used to its monotony, a curious change takes place which I have never seen noted or explained by the students of mental science. It may sound strange to say that monotony of its nature becomes novelty. But if any one will try the common experiment of saying some ordinary word such as "moon" or "man" about fifty times, he will find that the expression has become extraordinary by sheer repetition. A man has become a strange animal with a name as queer as that of the gnu; and the moon something monstrous like the moon-calf. Something of this magic of monotony is effected by the monotony of deserts; and the traveller feels as if he had entered into a secret, and was looking at everything from another side. Something of this simplification appears, I think, in the religions of the desert, especially in the religion of Islam. It explains something of the super-human hopes that fill the desert prophets concerning the future; it explains something also about their barbarous indifference to the past. We think of the desert and its stones as old; but in one sense they are unnaturally new. They are unused, and perhaps unusable. They might be the raw material of a world; only they are so raw as to be rejected. It is not easy to define this quality of something primitive, something not mature enough to be fruitful. Indeed there is a hard simplicity about many Eastern things that is as much crude as archaic. A palm-tree is very like a tree drawn by a child--or by a very futurist artist. Even a pyramid is like a mathematical figure drawn by a schoolmaster teaching children; and its very impressiveness is that of an ultimate Platonic abstraction. There is something curiously simple about the shape in which these colossal crystals of the ancient sands have been cast. It is only when we have felt something of this element, not only of simplicity, but of crudity, and even in a sense of novelty, that we can begin to understand both the immensity and the insufficiency of that power that came out of the desert, the great religion of Mahomet.