“Some call Sigil the City of Secrets, because everything that can be known is known somewhere in its twisting streets. Some call it the Cage, because it’s hard to get to and hard to leave. Mostly it’s called the City of Doors, thanks to the portals that connect it to the rest of the universe, like the hub of an enormous web of relationships and connections. A few wise souls like to think of Sigil as the microcosm – a tiny reflection of everything that is, everything that has been, and everything that yet could be, represented in the form of an enormous planar metropolis.

Sigil is a plane unto itself, existing outside the ordered structure of the rest of the universe and yet intricately connected to it through its unnumbered planar portals. It’s a filthy , noisy city with smoke-choked alleyways and crowded streets. The city is built on the inside of a gigantic, hollow ring that has no outside. To its citizens, though, it’s the centre of the universe – vibrantly alive, full of every imaginable treasure."
MANUAL OF THE PLANES 4E PAGE 25

The city hangs over the pinnacle at the centre of the plains of Concordant Opposition in the shape of an inside out doughnut. The inhabitants live on the inner ring and are subject to changes in illumunation working on a 24 hour cycle – 6 bright, 6 dark and 12 hours of twilight between the two extremes. At night the lights of the city on the opposite side twinkle like stars in a prime material sky.

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