Physicalize with standing waves between pairs of directional speakers.
Sound waves are temporary, nonsolid & invisible. Sound waves are physical.
Make your designs physical with standing waves.
Physicalize
Process
Multiple pairs of ultrasonic transducers form a transducer array.
Hardware setup for cube transducer array:
Wiring diagram
Pins
Components
To select positions of standing waves in transducer array and then output with Arduino see Design page.