Both sound and color make their effect on the human soul according to the law of harmony: to a fine soul color appeals, and to a still finer soul sound. Tone has either a warm or a cold effect, according to its element, since all elements are made of different degrees of vibrations. Therefore sound can produce an agreeable or a disagreeable effect upon man's mind and body, and has its healing effect in the absence of herbs and drugs - which also have their origin in vibrations.