The most abstract mode of expression in this respect is _number_, which, however, it is only possible to use as an indication of a further meaning beyond that it ordinarily elucidates when this significance is itself, essentially numerical. The numbers seven and twelve are frequently met with in Egyptian architecture, because seven is the number of the planets, and twelve is that of the lunar revolutions or the number of feet that the water of the Nile must necessarily rise in order to fructify the land. Such a number is then regarded as sacred in so far as it is present as a determinant in the great elementary relations, which are revered as forces in the whole life of Nature. Twelve steps or seven pillars are to this extent symbolical. The same kind of numerical symbolism has an extensive influence upon the form of widely famous mythologies. The twelve labours of Hercules, for example, appear to contain a reference to the twelve months of the year; for if Hercules under one aspect of the myth is no doubt presented to us as the thoroughly human impersonation of a hero, in another he unquestionably indicates a significance of Nature under a symbolized form, and, in fact, is a personification of the course of the sun. In a further and more complete sense symbolical configurations of space, labyrinthine passages, and such like carry a symbolical image of the course of the planets, just as dances, too, in virtue of their complex evolutions symbolically express the motion of the great elementary bodies. And further, on a higher plane, the bodies of animals are utilized as symbols, but most succinctly of all the human figure, which, even at this stage, as we shall see later on, appears to be elaborated in modes more compatible with its intrinsic worth for the reason that even now Spirit in general makes a real movement to embody itself from out the mere swaddling clothes of Nature in a shape more adequate to its own self-subsistent personality. Such, then, constitutes our general concept of the true form of symbolism and the necessity under which art labours to express the same. And in order that we may discuss the more concrete exemplifications of this type of symbolism, it will be necessary in dealing with this first plunge of Spirit into the wealth of its own resources to leave the East and direct our attention mainly on the West.