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Levitating display features pixels you can touch

We've already seen sound waves being used to levitate small numbers of foam balls, drops of liquid and even bits of lab-grown cartilage. Scientists at the Universities of Sussex and Bristol, however, have recently taken things a step further. They've created a low-res "display" in which the pixels are actually physical, tangible spheres, that float and can be individually rotated in mid-air.
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