976. Spheres are represented in nature in her three-fold kingdom, in no other way than by all the activities which form similar spheres and produce wonderful effects or phenomena, these being without number. These things can never be known as to their causes, except by cognitions of the spheres of activity that have been formed; for they form as it were a kind of universe, the qualities of which depend upon its form and the qualities of the form. This is so in the whole of nature.