The work of the painter, the poet or the musician, like the myths and symbols of the savage, ought to be seen by us, if not as a superior form of knowledge, at least as the most fundamental and the only one really common to us all; scientific thought is merely the sharp point — more penetrating because it has been whetted on the stone of fact, but at the cost of some loss of substance — and its effectiveness is to be explained by its power to pierce sufficiently deeply for the main body of the tool to follow the head.