Great Wheel
The Great Wheel is a popular model of the cosmos.
According to the Great Wheel model, all material worlds exist in the Prime Material Plane. Each is encased in a crystal sphere, which are separated by an ocean or "outer space" of phlogiston. These worlds are theoretically traversable physically.[1] Connected to the Prime Material Plane by the ethereal plane are the Inner Planes: the worlds of raw elemental matter. Finally, connected to the Prime Material Plane by the astral plane are the Outer Planes: metaphysical planes of spirit and mind.
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Notes
- ↑ i.e., if you had a rocket ship, you could literally fly from Greyhawk to the Forgotten Realms.