Why the cabin rights itself
The cabin’s pivot sits above its center of gravity—the point where its weight effectively acts. When the wheel carries the pivot upward or around, the cabin can rotate freely beneath it. If the floor tilts, gravity pulls the cabin’s lower mass downward, creating a turning force that brings the floor back toward level.
That turning force is called restoring torque: a twist that pushes an object back toward a stable position. The cabin does not need a motor to keep correcting its angle; its weight supplies the correction continuously.
A simple joint, with limits
The wheel controls the path of the pivot, while the cabin’s freedom to rotate lets it respond to gravity. That separation is the useful design choice: the structure can move passengers around a large circle without forcing the floor to rotate with the rim.
The cabin may still sway or briefly tilt as the wheel starts, stops, or encounters wind. Gravity keeps pulling it toward its hanging position, but it cannot cancel every motion instantly. The small pivot is doing a quiet balancing act throughout the ride—letting the wheel move the cabin while allowing the cabin to find its own level.
