Walking, talking holograms have been a staple of sci-fi films since Princess Leia was magically brought to life in"Star Wars".
Writing in the journal Nature, a team at the University of Sussex in southern England, said technology currently in use can create 3D images but they are slow, short-lived and"most importantly, rely on operating principles that cannot produce tactile and auditive content as well". This uses what is known as"acoustophoresis" -- sound waves that move and manipulate an object, in this case particles -- to form an image in a small box containing arrays of very small speakers.
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