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The world of Tanafar is heavily inspired by a world that was briefly described in Victor Pelevin's book "Love to three Zuckerbrins".
Feel free to include it into any campaign or any (hopefully) non-profit creative work.
However, a particular use of it in my mind is to replace the Ysgard Outer Plane of Planescape. Ysgard, in my humble opinion, is the least interesing of the Outer Planes, is too similar to Arborea, and it does a poor job of representing it's alignment. It's critical feautres can be distributed between Tanafar, Arborea, and, perhaps, a plane or two without a status of an Outer Plane.
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World: Tanafar
Revolutionary Carnival of Tanafar(1)
Size: Theoretically infinite.
Gravity: Unstable
Time: Normal
Alignment: Chaotic, good tendencies.
Stability: Divinely Morphic (locally - Highly Morphic)
Magic: Wild
Technology: Late Medieval

Clarifications: "Divinely Morphic" means that Tanafar's reality can be warped by divine will. "locally - Highly Morphic" means that there are places on Tanafar which reality is unstable and can be warped by the will of any sentient being. "Wild" magic means that spellcasting on Tanafar is less predictable than normally. "Chaotic" alignment of a world means that it abhors order, analysis, consistency, and laws, and embodies chaos, intuition, change, and violation of laws. "Good tendencies" mean that the world is somewhat hospitable and naturally more open to "good" people than to "bad" ones, but not so much to be called a part of the Heavens.


Cosmology

The main "layer" of the Tanafar is a finite, but enormous, planetoid, called the Seesaw, that is populated mostly on surface. The Seesaw is extremely urbanized body, covered in cityscape, ruins, jungles, mountains, and canyons. It is "orbited" by it's three moons ("pseudomoons", if you are a pedant) - The Liberty, The Equality, and The Fraternity. Those moons dance around the Seesaw in complete disregard to any celestial mechanics - their movement may suddenly and instantly reverse it's direction, and it's not that uncommon to them to fly away from the Seesaw's range of vision, of to descend to it and hover just 50 meters above the surface(2). Nobody remembers those planetoids to ever collide with each other or with Seesaw, however. Each moon is finite in size and can be considered a separate layer of the world. The moons' unpredictable movements dramatically influence the life on the Seesaw in a vast number of ways, causing great destruction and inspiring great creation. Lastly, the infinite space in which those four spheres reside is called The Starfield - the last "layer" of the plane. It is tightly stacked with "stars" (glowing spheres) of all sizes - from a sparkle to a small planet (no "real" stars here). There is no sun in the Tanafar, no day or night, and the world is constantly illuminated by the Starfield, as well as the fluorescent-like light of it's moons. Natural vitalizing aura of the world renders sleep not just unnecessary, but nigh-impossible.


Seesaw


The Liberty

The Liberty, white pseudomoon of Seesaw, is one of the safest locations in the multiverse. It is also one of the loneliest ones. It appears to be a flat, featureless surface, with fruit trees and small ponds of water rarely scattered around, below a sky thickly covered by white clouds.
However, the most unique and distinctive thing about The Liberty is it's geometry. It's simplest explanation is that only people with mutual desire to meet or interact can ever meet or interact on The Liberty. As soon as at least one person feels irritated or threatened by a presence of another, there could be no movement in a direction from one to another. A step, seemingly towards such a person, would bring you a step away from it. An arrow, shot seemingly into such a person, would land a hundred meters away from it. Even a nuclear-scale explosion in five meters from a target would do nothing to it, as long as it and an initiator of an explosion have a mutual desire to be near each other. If someone is unsuspecting of a sneak attack or a treason, it could harm them, but if you are properly paranoid, no assassin or traitor can go anywhere near you on The Liberty. There is also a reverse effect - if two individuals, strongly and mutually, seek each other, there is almost no stopping them, and the distance between them wouldn't mean much.
Locals often like to say that The Liberty is a world where everyone is free, yet nothing is free. Fruits that grow on local trees are very bitter, unless they are meticulously cooked. The water in the ponds is always sour due to a (small) concentration of dissolved acid, that should be filtered out, evaporated, or magically purified. Local wood and stone need special preparation to pass for construction materials. Ores are always buried deep underground. Life on The Liberty has a lot of advantages, but it is almost never easy.
Obviously, the majority of time spent on The Liberty by most people is spent in solitude. A lot of groups of people arrive here to put their unity and dedication to the test. A lot of people here are ascetics and freethinkers. Many more - refugees and paranoics. Many arrive to exchange things that can only be exchanged here - in an atmosphere of absolute privacy and consent. And, of course, many of the most faithful and radical champions of freedom call The Liberty their home.

Locations on The Liberty:

The Bazaar
A single, tacky, trading stall, standing in the middle of nowhere. Or at least that's what it appears to be. In reality, The Bazaar consists of millions of identical stalls, simultaneously existing in one location. The one initially perceived by a client is the one selling things he desires to buy the most, but it can be changed by a small exertion of willpower. When multiple clients interact simultaneously with the different stalls of Bazaar, they don't see or feel each other. Anyone can also go to The Bazaar with the intention to sell something - then, he will find an empty stall, with an appropriate sign and, perhaps, even some clients in line, if their goods are sought after. There is almost no ground for unfair competition at the Bazaar, and the quality of goods is outstanding. However, most merchants here are united into a guild, and try to keep the price on most goods as high as possible. As there is no way for them to enforce their dominance, anyone willing to offer a cheaper price can do so. Obviously, if a person on The Liberty desires to buy anything, they likely will quickly walk to The Bazaar, no matter where they are.

The Wall of Carvings
An enormously long, dark gray, and monolithic stone wall, that is about a meter high, with a lot of engraving tools scattered around. On the wall, true to it's name, there are a lot of carvings. Moving carvings. Although they never change shape, the messages on the wall quickly resize and move around it, appearing before anyone interested. Anyone can leave their trace here - and nobody and nothing can remove anything from The Wall of Carvings. Old messages move underground, but can always, always be brought back by anyone interested.

The Equality

The Fraternity

Starfield










Content related exclusively to this world as a plane in Planescape

The Liberty is a common place of meetings between the Baatezu and the Tanar'ri - be it for attempts at diplomacy, Blood War espionage and treason, or love.



















(1) Tanafar (arabic) - Disharmony, Repulsion. Thanks, Google Translate. Also, "Revolutionary Carnival" has at least two meanings - the flow of life on Seesaw, or the "revolution-al" dance of the Seesaw's moons around it.
(2) It must also be noted that objects on the moons don't feel their immense acceleration. Take that, Newton !

Extras

Recommended music

I'd suggest you to put long, discussion-type posts into spoilers to not clog up the thread.