A passenger seat for a vehicle includes a seat back; and a seat bottom, which may be mounted to a fixed backshell. The seat bottom is selectively configurable such that at least a portion of one side thereof is higher than at least a portion of the opposite side thereof, relative to a floor of said vehicle, so as to support a passenger who is seated on said seat bottom in a rotated position wherein one of said passenger's hips is higher than the other hip relative to said floor.