It is the gradual increasing activity which causes vibrations to materialize, and it is the gradual decrease of the same which transmutes them again into spirit. As has been said, vibrations pass through five distinct phases while changing from the fine to the gross, and the elements of ether, air, fire, water and earth - each has a savoir, color and form peculiar to itself. Thus the elements form a wheel which brings them all in time to the surface. At each step in their activity they vary and become distinct from each other, and it is the grouping of these vibrations which causes variety in the objective world. The law, which causes them to disperse, man calls destruction.