Whether this be so or not, it is to be noted that all the peoples whose drawing shows this peculiar power of visualisation belong to what we call the lowest of savages; they are certainly the least civilisable, and the South African Bushmen are regarded by other native races in much the same way that we look upon negroes. It would seem not impossible that the very perfection of vision, and presumably of the other senses[13] with which the Bushmen and Palæolithic man were endowed, fitted them so perfectly to their surroundings that there was no necessity to develop the mechanical arts beyond the elementary instruments of the chase. We must suppose that Neolithic man, on the other hand, was less perfectly adapted to his surroundings, but that his sensual defects were more than compensated for by increased intellectual power. This greater intellectual power manifested itself in his desire to classify phenomena, and the conceptual view of nature began to predominate. And it was this habit of thinking of things in terms of concepts which deprived him for ages of the power to see what they looked like. With Neolithic man drawing came to express man’s thought about things rather than his sensations of them, or rather, when he tried to reproduce his sensations, his habits of thought intervened, and dictated to his hand orderly, lucid, but entirely non-naturalistic forms.
How deeply these visual-conceptual habits of Neolithic man have sunk into our natures may be seen by their effects upon hysterical patients, a statement which I owe to the kindness of Dr. Henry Head, F.R.S. If the word “chest” is mentioned most people see a vague image of a flat surface on which are marked the sternum and the pectoral muscles; when the word “back” is given, they see another flat or almost flat surface with markings of the spine and the shoulder-blades; but scarcely any one, having these two mental images called up, thinks of them as parts of a continuous cylindrical body. Now, in the case of some hysterical patients anæsthesia is found just over some part of the body which has been isolated from the rest in thought by means of the conceptual image. It will occur, for instance, in the chest, but will not go beyond the limits which the conceptualised visual image of a chest defines. Or it will be associated with the concept hand, and will stop short at the wrists. It is not surprising, then, that a mode of handling the continuum of natural appearance, which dictates even the behaviour of disease, should have profoundly modified all artistic representations of nature since the conceptual habit first became strongly marked in Neolithic man. An actual definition of drawing given by a child may be quoted in this connection, “First I think and then I draw a line round my think.”