9. In order to understand properly my form of illustration, it must be borne in mind, that the mental or cosmic realities expressed by my pictures have no material or physical form but are identical with cosmic universal laws, fundamental principles, ideas, causes and methods of sensing. But realities which have no material pictorial form cannot, of course, be reproduced, copied or photographed. Consequently, my illustrations are in no way identical with photographs or artistic reproductions of what they represent, as might very well be the case, for instance, with a geographical map. On the contrary, my illustrations come into being in the following way; when I wish to illustrate one or another of the above-named formless realities, I give to each of the more important, local details occurring in the said reality, a particular mark or sign, either in colour, line or shape. These varying signs are then combined or arranged in a certain order or succession which corresponds to the combination - invisible to the physical senses - in which they exist in reality. In this way, a material picture appears which in its nature is not a copy of, but a visible mark or clue to a reality invisible within the material field. The practical result of this is that the cosmic realities in this manner attain a certain accessibility to material sight, so that some of the human beings who have not yet developed a sensory endowment over and above that mentioned sight, will thus be enabled to begin to work with them at an earlier stage than might otherwise have been the case, and by that obtain knowledge of the experience of life which would otherwise have remained hidden. My illustrations do not, then, reproduce pictorially what they are intended to express, but on the contrary symbolize it, and hence can rightfully only be regarded as symbols.