Colossal
Japanese engineers have created a system that not only levitates objects, but can also move the objects up, down, left, and right using external controls. Using ultrasonic standing waves from four arrays of speakers, the researchers noted that millimetre-sized particles "were levitated and moved three-dimensionally", extending upon previous work that had achieved movement along one fixed axis.
You can read more about the study in this Arxiv paper: "Three-dimensional Mid-air Acoustic Manipulation by Ultrasonic Phased Arrays". Or just watch the video above and gawp...
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