The space is filled with sourceless light; there is no night and no shadow outdoors. It holds one star and its worlds. The gate stands on one of them.
Water climbs the slope instead of falling down the hillside. A new device risks breaking the trade that feeds the whole land. Three great families divide the world between them and marry only among themselves.

"The light never dims, but the heat kills the day."
from Annals of the Ridge, by Yashun
The gate opens on Dimensional Station sector 1. Its doors measure the standing area of Earth's whole surface. The guides are a closed caste who hold the license for use.
"There is no violence in the Dimensional Station. Violent offenders will be removed."
from Tide Tables of the Basin, by Dishe
Licensed guides alone may open the gate. An unlicensed attempt ends in exile from the station. Violence against a guide or a licensed trader leads to removal back to the offender's own world.
A new invention threatens the trade that feeds the land. The families fight over who blocks it. The Hotuchi lead the block while the Rachoru push for change.
Living here costs ten credits a head for passage and a thousand per hull to cross the gate. Cargo goes free but fuel from this world is required for machines.