The Sephiroths are different “levels” of reality. ‘Dimensional’ areas that are connected and yet separate from one another, much like the layers of an onion. At the bottom is Malkuth, the physical world where we dwell. At the other extreme lies the nearly unreachable Kether, where the Creator is said to dwell.
It is said that there are ten Sephiroths, each with its own natural laws, all connected to the others through gates and roads that can be found by the wise and the powerful. Each Sephiroth is in turn the home to several, or in some cases hundreds of, Realms. Pocket dimensions with their own characteristics. The Sephiroth of Geburah holds dozens of Realms, all dealing with an aspect of Death.