The Lattice

The Lattice of Creation, or the Great Wheel, is the ordered creation of the entities Aon and Noa upon which hang the known planes of existence. It is often represented as a series of somewhat concentric spheres. In the center is the Prime Material plane containing the phlogiston with the crystal spheres and worlds within, surrounded by an Ethereal plane (misty realms of proto-matter). Outside of the Prime and Ethereal are the Inner planes, also called the Elemental planes, which have their own structure. Then comes the Astral plane which connects the worlds in the Prime Material plane to each other and also to the last sphere, the Outer planes. The Prime Material plane touches both the Astral plane and its Ethereal plane, though these planes do not touch one another. The Outer planes, also called the Planes of Power, are 16 planes arranged in a circle (the Great Wheel) defined mainly by alignment and surrounding a 17th neutral plane known as the Outlands.
The Inner planes are the six major elemental planes (Fire, Earth, Water, Air, Positive Energy, Negative Energy), the four para-elemental planes (Smoke, Ice, Ooze, Magma), and the eight quasi-elemental planes (Lightning, Steam, Radiance, Minerals, Vacuum, Salt, Ash, Dust). They can be thought of as being on the surface of a sphere with Positive Energy at the north pole, Negative Energy at the south pole and Fire, Earth, Water, and Air on the equator, equidistant from each other. The para-elemental planes are found on the equator between the boundaries of Fire, Earth, Water, and Air (Magma was between Fire and Earth, for example). Four of the quasi-elemental planes are found between the boundaries of Positive Energy and the four elements (Steam was between Positive Energy and Water, for example). And the other four quasi-elemental planes are between Negative Energy and the four elements (Vacuum is between Negative Energy and Air, for example). The Inner planes are surrounded by the Ethereal planes, which connect them to the Prime Material planes.