Perfect for rotating, time-varying data visualization (e.g., a levitating globe that turns to show weather changes over a 24-hour cycle). 3. Photophoretic Levitation A focused laser heats one side of a thin, lightweight particle (like a carbon-coated microsphere). The resulting thermal creep flow keeps it aloft. By steering the laser, the particle can be moved at high speed.

Multiple particles can be choreographed over time to draw animated 3D symbols in air—like a floating logo that morphs into a countdown timer. The "4D" Difference: Why Time & Touch Matter Traditional 3D levitation is a static trick. Levitation 4D adds:

In essence: It is volumetric display plus haptic feedback plus motion control. 1. Acoustic Levitation Arrays of ultrasonic speakers create high-pressure nodes in the air. Small lightweight particles (e.g., water droplets, styrofoam beads) get trapped at these nodes. By rapidly shifting the nodes, the system moves the particle in 3D space faster than the eye can track, creating the illusion of a solid, animated shape—a "voxel" cloud.

Time-sequenced acoustic fields can also generate focused ultrasound on your skin, allowing you to feel the levitating object as a gentle buzz or pressure. 2. Magnetic Levitation (Diamagnetic or Electrodynamic) Using strong magnetic fields, objects with magnetic susceptibility (like graphite or specialized composites) can be pinned in air. While usually static, dynamic control of coils enables 3D motion and object rotation.

| Dimension | Description | |-----------|-------------| | | The object floats freely at any coordinate. | | Temporal (T) | The object's shape, position, and properties change in real time in response to data, user input, or environmental changes. | | Interactive (feedback loop) | Users can reach into the empty space and "touch" the object via ultrasonic tactile rendering or motion tracking. |

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