Hologram-like device animates objects using ultrasound waves

Researchers in Sussex have built a device that displays 3D animated objects using ultrasound waves. The device uses a 3D field of ultrasound waves to levitate a 2mm-wide polystyrene bead and whip it at speeds nearing 20 miles-per-hour to trace aerial shapes. Researchers aim to allow 3D interactive communications on the device, similar to the technology seen in 'Star Wars'.