Another principle, then, of artistic composition is rhythm, and this, too, is founded on an instinct of human nature. Let us see what rhythm is. A small boy has found an old pot, catches up a stick, and begins to belabor the pot and make himself a nuisance. By and by he gets tired of his own noise, imagines his pot a drum, and hits it with rhythmic strokes, one following the other in measured beats. Watch how his legs begin to move to the time of the strokes, and how the other youngsters fall in behind him. Left, right, left, right, on they march; their legs and shoulders swinging to the rhythmic beat. I wonder if they know they are following an instinct, pretty nearly as old as humanity. Probably they don’t, and wouldn’t care if they did. All they know is that they are having a good time. That’s just it! And they are having the same sort of good time that the primitive man gave his friends, when he first hit on the idea of clapping his hands together in rhythm. Later on he found he could get more stirring effects and save his hands by rhythmic hammering of one piece of wood upon another. Then came along a primitive Edison who perfected the principle and put tom-toms on the market. And so, in time, music came to be invented. For the basis of music and of the pleasure that is received from it is its measured beat or rhythm.