Man, this is incredibly cool. Imagine we could do something similar with spacetime itself---then we really would have Star Trek-style tractor beams! Oh, and also this could have real-world applications as is.
If I had time I would like to understand what's different about the physics of water surface waves vs. "body waves" like light waves or sound waves that travel through the whole body rather than just the surface.
Apparently there has been other academic research on tractor-type beams.
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