today we talk about space from a visual perspective, and one computational challenge is how to design virtual space to give it depth, to be able to move around in it.  Haptic space involves the problem of how to give the feeling of movement and interaction in virtual space, e.g., how to supply virtual objects with texture, weight, pliancy etc.  Also how to convey kinesthetic and proprioceptive feelings to the act of maneuvering in virtual space…  here’s a brief video of an early experimental technology