A diameter of the compressible elastic member is greater than or equal to 40% of a diameter or a length of a diagonal of the top surface of the seat assembly. In response to offset weight placed on the seat assembly, the compressible elastic member selectively compresses causing the seat assembly to axially tilt in substantially any direction such that a plane of the seat assembly tilts downward from a neutral position substantially parallel to the floor, and decompress to the neutral position.