1. Japanese scientists have worked out how to make objects levitate using sound.
The process is called 3D mid-air acoustic manipulation.
2. This is how it works.
Particles are trapped in the node of a standing wave at the focal point created by four phased-arrays.
This means that by carefully positioning speakers around the object and playing a note of the right frequency, the scientists can make a pocket of moving air that holds the object in mid-air.
4. Watch the whole video here.