Two thematic rings or orbits of spheres exist, the Essence Ring and the Elemental Ring. There isn’t too much meaning to them besides grouping similar concepts together in the cosmos.
Essence Ring - Consists of the essence spheres which partially includes the Prime sphere. An essence sphere is made of one of the fundamental components of reality: matter, spirit, mind, and life.
Elemental Ring - Consists of the four base elemental spheres and the four composite elemental spheres. An elemental sphere consists of a sphere made out mostly of its element, though there are some amounts of other elements present, particularly from adjacent spheres