But I have begun this story in the cave, like the cave of the speculations of Plato, because it is a sort of model of the mistake of merely evolutionary introductions and prefaces. It is useless to begin by saying that everything was slow and smooth and a mere matter of development and degree. For in a plain matter like the pictures there is in fact not a trace of any such development or degree. Monkeys did not begin pictures and men finish them; Pithecanthropus did not draw a reindeer badly and Homo Sapiens draw it well. The higher animals did not draw better and better portraits; the dog did not paint better in his best period than in his early bad manner as a jackal; the wild horse was not an Impressionist and the race-horse a Post-Impressionist. All we can say of this notion of reproducing things in shadow or representative shape is that it exists nowhere in nature except in man; and that we cannot even talk about it without treating man as something separate from nature. In other words, every sane sort of history must begin with man as man, a thing standing absolute and alone. How he came there, or indeed how anything else came there, is a thing for theologians and philosophers and scientists and not for historians. But an excellent test case of this isolation and mystery is the matter of the impulse of art. This creature was truly different from all other creatures; because he was a creator as well as a creature. Nothing in that sense could be made in any other image but the image of man. But the truth is so true that, even in the absence of any religious belief, it must be assumed in the form of some moral or metaphysical principle. In the next chapter we shall see how this principle applies to all the historical hypotheses and evolutionary ethics now in fashion; to the origins of tribal government or mythological belief. But the clearest and most convenient example to start with is this popular one of what the cave-man really did in his cave. It means that somehow or other a new thing had appeared in the cavernous night of nature; a mind that is like a mirror. It is like a mirror because it is truly a thing of reflection. It is like a mirror because in it alone all the other shapes can be seen like shining shadows in a vision. Above all, it is like a mirror because it is the only thing of its kind. Other things may resemble it or resemble each other in various ways; other things may excel it or excel each other in various ways; just as in the furniture of a room a table may be round like a mirror or a cupboard may be larger than a mirror. But the mirror is the only thing that can contain them all. Man is the microcosm; man is the measure of all things; man is the image of God. These are the only real lessons to be learnt in the cave, and it is time to leave it for the open road.