Abstract: A facility for conditioning people for transition between different gravitational environments. The facility comprises a static cylindrical vessel and a revolving cylindrical habitat within the vessel. Within the revolving habitat are supported a number of habitation levels formed or derived from concave-up circular paraboloids, each shaped and sized so as to produce local net acceleration vectors orthogonal to its upper surface. On any one such surface, the local net acceleration magnitudes within a certain band of radii from the axis of revolution of the habitat will approximate that of the native acceleration present in a particular environment, such as Mars or the Earth. Living areas may be constructed on these surfaces, particularly within the target zones. Access to the habitation levels is provided by a central elevator shaft and system. The habitat is supported hydraulically and caused to revolve by hydromechanical swirling applied at its bottom surface.