(_β_) In addition to these fundamental requirements of clear definition and correspondence with the natural facts a certain elaboration of detail will frequently much assist us in presenting the external aspects of a picture which our perception or imagination can readily seize. Unquestionably, owing to the nature of the particular medium in which the several arts express themselves, there will be a marked difference of range to which, in any particular case, this process may be carried. If we take the art of sculpture, for example, we shall find that the repose and universality, which are the fundamental features of its characterization, are less consistent with this elaboration of external detail than is the case in some other arts. Externality is here neither defined as a particular place nor a particular environment, but is entirely concentrated upon such details as drapery, arrangement of hair, dress, weapons of war, mode of seat and the like. Nay more, the actual definition of many figures in antique sculpture is only obtained through an entirely conventional arrangement of drapery or hair, or other distinguishing accessories. This is not, however, the place to discuss further the significance of the conventional. It is obviously outside the sphere of natural fact and rather related to the contingent; or, to put the matter in this particular case more fully, it is the means through which we arrive at that which is more universal and persistent in our final artistic effect.