Geometries are linked universes within the Discontinuum which share some common properties. The term is used by the Stability Council to categorise related spaces, both within the Archetypes and Evolutions, across the barriers between them and sometimes in stranger dimensions of the discontinuum that may not properly be described as either. Some geometries may permit relatively easy transfer within them, whilst others are linked on a more conceptual basis and can have strong barriers to travel. The geometries listed here are shown in an aproximate order of decreasing stability, but this is not always easy to specify since some geometries may associate realms that differ in their stability.