When reading all things astral — astral travel, astral projection, astral planes — my biggest complaint is usually the vague, undefined nature of the reference. Rarely does one get a real sense of what an astral plane looks like, feels like, etc.
Not so in this document, found in my non-astral digital travels. This document so thoroughly described the astral planes that my curiosity has been engaged to a surprising new level.
The-Astral-Planes-and-Other-Worlds-of-Spir-Unknown