The Unity of Rings
Everything comes in rings, both figuratively and literally. Sigil is a ring, just as the Outlands are comprised of consecutive rings. Both the Inner and Outer Planes form rings, as do some of the greatest pathways of the multiverse. This pattern represents a greater order: things have no true start or end, but continuously lead to one another and back to whence they came. Even the nature of the gods and the greatest forces in creation are said to move in circles, encompassing all that exists within their domain but never truly going anywhere. The cynical might cite the Unity of Rings as proof that things never truly change, but the truth of it is the course of history is a culmination of even the smallest details, and the consequences of one’s actions will eventually come back to them.