Secondly, there is the matter of interfacing the subject with a real-time physical environment. Now place this subject in an environment void of light, except for a line guided path which the subject would begin to walk upon. The rest is merely a matter of experience, learning to distinguish shapes and details. But the key is to create conditions that offer instant feedback in a real and physical space. This is the kind of endeavor in which the human mind invariably excels to astonishing heights.
Adaptability is the strongest single resource of the brain.
If a useful orderly image is made available, the brain will tune in to it. The only necessary ingredient to achieve effective results where human beings are involved, seem to be determination and endurance. I expect there will be no shortage of these elements. A stationary subject would not offer the kind of real-time feedback necessary for the subject to begin adapting to the device, nor for the brain to discover and correlate the relevance and usefulness of the area being stimulated. Putting such a device on a stationary subject, would be like inventing a parachute and then attempting to test it from the deck of a submarine.