Nature is the totality of occurrents, but it is an organized totality. Hence, in the consideration of nature it does not suffice merely to mention the elements; one must also show how the elements are structurally united into complexes. The most important of the dissociative complexes are those in which there is an identity of space with diversity of time, as in the history of a mountain, or an identity of time with a diversity of space, as in a society of human beings at a period. The structure of dissociative complexes exhibits many features analagous to those of associative complexes. Complexes may vary along a dimension which may be called “homogeneous-heterogeneous.” This dimensional variation is determined by the degree of similarity exhibited by the elements of the complex with reference to one another.