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I'm actually more interested in doing this at the larger macro scale than the micro scale. Imagine the ability to lift heavy objects with only sound. Weight rooms would look entirely different :)

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This guy made something along those lines. He calls it "orthosonic lift": https://youtu.be/H-88gsWLTac?t=126

Also check out this "acoustic streaming" video: https://www.youtube.com/watch?v=-ZE2Mnzc7mA

Holo display. A bucket of glass beads suspended in air.

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.

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