The Quietener is a research station in the Mimosa system, belonging to acoporeals. It contains a vacuum in its interior that's as perfect as the technology at the time allowed, significantly purer than that of the space surrounding it.

The Quietener is where the novo-vacuum originated, following an experiment by Cass. Cass set out to explore the corner cases of the Sarumpaet Rules, accidentally discovering that they did not hold quite as true as she and others were lead to believe.