A support apparatus can comprise a cylindrical rod extending along a first rotation axis and comprising a first end portion provided with a first convex spherical segment and a second end portion provided with a second convex spherical segment. A first area can be configured to receive a portion of the first convex spherical segment. A second area can be configured to receive a portion of the second convex spherical segment. The cylindrical rod can be pivotable about a first pivot axis perpendicular to the first rotation axis. In some embodiments, methods of supporting an object can comprise engaging a surface of the object with the outer surface of the cylindrical rod wherein the first cylindrical rod supports a weight of the object while the first cylindrical rod is supported by the first fluid cushion and the second fluid cushion.