Sighted subjects can accurately direct a light-beam source mounted on their head to the position of their hand on a vertical or horizontal scale by tipping their head in the up-down dimension. A blind person might be trained to utilize head-tip cues for location or objects in space. If he scanned his environment vertically (by tipping his head) with a horizontal linear array of photosensitive elements, presence of an object at a given position and elevation could be signalled to him by a small light attached to the object.
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