The world presents a ring of solid land orbiting a bright core inside an infinite space filled with rock. About 324,506 people live mostly underground while surface dwellers avoid the drifting debris fields caused by the slow pull.
Great works stand everywhere though nobody knows who built them or when they were constructed. The ground tilts slightly to resist the constant drift of loose objects, forcing all structures to face this one-way pull.

The world presents a ring of land orbiting a bright core while loose objects drift slowly one way.
from Account Book of the Drift, by Sleabrich
The space is filled with solid rock and life keeps to the hollows and tunnels in it. Structures face this constant pull because the ground itself tilts to resist the slow drift.
Water circulates through tunnels carved into the solid rock medium, filtered from ancient salvage systems repaired past their original design. Waste goes into deep shafts drilled into the rock floor, sealed to prevent contamination of the few remaining surface pockets.
A small scavenger lives everywhere people live and cannot be got rid of.
from Manifesto of the Stone, by Fuigluill
The Fogliadan merchant guild controls the land near the gate because they guard the seam entrance on Niaclui. The Diglisli waste collectors control the rest by sorting salvage in Tislird while keeping the tunnels clear for traffic.
A single power holds the gate on Niaclui and decides strictly who passes through its threshold. To leave one must present a permit issued by the ruling council standing at the western edge of Seara.