It depends on the astral realm. When I go to the one that most closely resembles the physical world, I can see the same structures, like my bedroom, but they look more wispy and less solid, as if everything is slightly alive with energy. It's like nothing I've ever seen with my physical eyes, not even in a movie.
It's more like I sense objects rather than see them. I can perceive what's behind me as well as what's in front of me. It's hard to separate the visuals from my other sense perceptions, since it seems like it's all coming through the same channel. I can't see through walls, but I can feel their presence and walk through them if I want. Sliding through a wall doesn't feel very pleasant though -- it's like moving through a vat of pudding that slides between your cells.
AP is a very different experience than having a dream, even a lucid one.
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