I just finished the third and last campaign in a series of interlinked Planescape campaigns I've been DMing for the past several years. The metaplot culminated with the end of the Great Wheel, as it was reset and redesigned. Basically a new cosmology was formed (I might post an article about it at some other point).
So for future campaigns we'll be playing in a new cosmology and now I have to decide how to go about creating it. This thread is just an attempt to discuss favorite cosmologies from different sources (rpg, fantasy books, anime, videogames, etc.).
RPG:
Obviously Planescape is a favorite. But what makes it so great? Moral ambiguity, the wonder of the planes, different takes on old races and themes... but I think what really makes PS stand out is the 'belief is power' theme. It gives the setting a common and recurring theme, some sort of backbone, a personality of its own. So maybe a new cosmology would benefit from some sort of backbone like this, a common theme or guiding principle.
Both Nobilis and Wonderland also offer really interesting cosmologies, especially Wonderland, which is truly unique. But they tend to be more specific to certain themes and less universal. That's not a problem in itself, but for a D&D game I might want to consider a different approach.
Beyond Countless Doorways is a good starting point - more and more I feel inclined to use it. But I will need to add more to it, it lacks that certain characteristic that makes a setting truly unique and special.
Fantasy books:
The Chronicles of Amber, by Roger Zelazny. Simply amazing. To me the Chronicles of Amber is to the fantasy genre what Planescape is to RPGs. Zelazny gives us a really original perspective on the whole law versus chaos struggle as well. But I want to avoid having alignment play any significant role in this new cosmology. I'm a bit tired of it, in all honesty.
The Cthulhu cosmlogy(ies), by H.P. Lovecraft. While I don't consider Lovecraft a very good writer, the cosmologies he developed in his stories are awe inspiring to say the least. Nothing goes quite so deep on the nature of the universe in my opinion. And how disturbing is that nature!
Videogames:
Xenogears/Xenosaga is a favorite in the cosmology department. Some people say the series is an Evangelion clone. But if that's the case, the clone is far more interesting and sophisticated in my opinion. At least as far as story/cosmology is concerned. This is probably the cosmology that influences me the most as a Planescape DM.
Final Fantasy VII, as much as I hate to admit it. But back in the day it really changed the way that I look at fantasy.
Anime:
As much as I love anime, I can't think of any that really stood out mostly for its cosmology.
So... does anyone have any ideas and/or favorite cosmologies to share?
I like the cosmology in the Fullmetal Alchemist anime, with its terrifying gate and mysterious dark entities inside, connecting the two worlds.
The Kabbalistic Tree of Life is fascinating. Jem presented it as a cosmology in this thread: /forum/otz-chaim-a-planar-highway-pathfinder