Under this heading are grouped external representations of two or three dimensions, thus including drawing as well as the moulding commonly understood as plastic. Here it is more difficult to distinguish between play and art than in dramatic imitation, since, while the child nursing her doll, or putting his tin soldiers through a drill, thinks not at all of spectators, and how they will be affected; even an infant artist is always eager to show what he can do. It can, however, be generally prevised that pictorial imitation is a play only when pure joy in the act of production fills the soul of the copyist. I begin with imitative drawing, which seems to be widely practised, not only by children but by primitive people as well, and will therefore claim most of our attention. Its origin is not clearly determined, though von den Steinen’s observations make out the case pretty clearly for their connection with language of gesture. “The simplest drawings,” he says, “are those connected with gesture. When a savage repeats the cry of an animal in one of his spirited dramatic tales and wishes to make the effect more forcible, he also imitates the creature’s bearing, gait, and movements, and pictures special peculiarities, such as long ears, trunk, horns, etc., in the air with his hand. Such actions for the eye form a parallel to the voice imitation for the ear, but when they still do not suffice, drawings are made on the sand. In the absence of word equivalents for communicating with them I myself have often taken refuge in such sand writing.”[583] He goes on to say that he thinks, although his observation has been confined to Indian tribes, the further development of drawing followed for the purposes of communication after the idea of making pictures was once grasped; and that finally they were made without such practical aim, efforts were made to improve the technique, and all sorts of natural objects were represented in interesting and novel aspects.[584]