
As per title. This base piece is a quarter of a circle.
Applying shrink/expand on the flat sides shrinks/expands the room between1/4, 1/6 or 1/8 of a circle.
Applying shrink/expand on the curved side decreases/increases the size of the room as expected.
Multiple quadrant base pieces can be fitted together to form a full circle, as an analog of the multi-purpose room, or in an S shape. Orientation of the curved side is changed using the scroll wheel or however it is done on xbox.
Windows/hatches can be placed on the curved or flat sides. Basic rooms/corridors can be connected where space permits.