Take a look at a hologram of a 3D rabbit.  Explain how it was created

Ultrasound can be used in a number of ways, one of which is used to sonicate objects to create hologram-like displays.

One of the fruits of this technique is a three-dimensional rabbit. A breakthrough in his case is the fact that so far acoustic elevation has only been possible in empty rooms. However, the new algorithm can modify the sound waves so that if it encounters an obstacle, it can keep the object in the air.

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Because while sound waves can be configured to lift certain objects, problems usually arise when another object appears in the field of view. This, of course, had a tendency to reflect or scatter the waves. Ryūji Hirayama at University College London and colleagues had previously raised 3D shapes and are now making further progress. Their computational technology allows objects to be lifted and controlled over rough surfaces in the presence of other objects.

The article on this topic found its way into the columns science progress He explains how 256 tiny retinal speakers helped lift objects using precisely emitted ultrasound waves. When the latter came into contact with objects that would normally dissipate the wave, a computer algorithm immediately modified its shape to keep the chosen object in the air.

256 loudspeakers were used to raise the voice

The efficacy of the described method was demonstrated by 3D printing a small plastic rabbit. Later, other beings got into the action, but either way the end result was impressive. For example, members of a research team could have lighted balls flying around a rabbit, assuming the shape of a butterfly whose virtual wings can be controlled with finger movements. In another case, the scientists raised a drop of paint over a glass of water. This confirmed that their algorithm could be applied to objects that could change their shape.

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How do we put these achievements into practice? It is enough to imagine all kinds of exhibitions, for example, in museums or art galleries. Advertising of different types of products is also at risk, and even applications in chemical engineering, where sound waves can be used to mix materials without having to touch them. The authors themselves intend to improve their method so that it allows you to control objects in the air with sound, when all other objects in the room move in an unpredictable way.

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