Holo Display: generate the refractive voxel via ultrasonic convergent propagation fringe pattern, and light the voxel with IR that becomes higher frequency visible light color at point of interfearance/intersection.
PrHoteph: hyperplanes are your friends, may they guide your long distance acoustic whisper / ultrasonic voxel intersections.
PrHoteph: hyperplanes are your friends, may they guide your long distance acoustic whisper / ultrasonic voxel intersections.