Here is the extent of 3-D computer touch at the moment:

What is wrong with this picture? Well, you are feeling a virtual 3-space with a stick -- which is connected to a 3-D pantograph which projects a virtual stick into the computer-generated environment.

Basically, the biggest problem is that, for the sighted, the space in which the physical end of the stick is located is not registered with the visual display of the virtual space. The viewer is disconnected by the fault of the pantograph device. For everyone, you are just feeling virtual three-space with the end of a stick, which is pretty unsatisfactory.

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