The foregoing selection also illustrates a very important form of non-verbal communication, namely, the demonstration, together with its usual accompaniment, participation. Demonstration and participation are the most vital of all the forms of communication; in fact a specific act of communication is hardly complete until it reaches the stage of participation. The education of the workaday world relies on demonstration and participation almost entirely; the schools use them largely in teaching the manual arts, the natural sciences, and in all elementary education.

Systems of signals that appeal to the sight, or to the hearing through non-verbal sounds, exist in great variety. In a schoolroom of intermediate grade, especially if the teacher's idea of order is to be able to hear a pin drop, children become adepts at silent communication.

The girls I played with sat at the opposite side of the schoolroom. During school hours we sometimes thought of things we wished to do at recess. If we were planning to sew we would motion as if performing the act; if we were to have a game we would run our fingers along the desk to imitate the movements it would require. These gestures were supplemented by facial expression and movement of the lips.

In our baseball team the pitcher and the catcher had from eight to twelve signals for as many different plays. Before we had our signals we played a neighboring team and lost by a score of 5 to 18; six weeks later, with our system of signals, we played the same team and beat them 2 to o.

Pictures and other art products stand ready to deliver their message whenever anyone present is in a mood to receive it. They, like literature and institutions, are, as Cooley says, the outside or visible structure of thought. . . . By the aid of this structure the individual is a member not only of a family, a class, and a state, but of a larger whole reaching back to prehistoric men whose thought has gone to build it up. - Cooley, Social Organization, p. 64.

The things man has made, but works of fine art above all others, reveal the lives of their makers; they communicate personality.