The mystic sees on the abstract plane one or other element predominating at a certain time, either ether, air, fire, water or earth. Every element in the finer forces of life is rendered intelligible by the direction of its activity and color, and the various forms of light show its different rates of activity. For instance the feeling of humor develops into greater humor, and sadness into a deeper sorrow, and so it is with the imagination: every pleasant thought develops pleasure and expands into a still pleasanter thought, and every disagreeable imagination grows and becomes more intense.