Researchers at Duke University are coming close to creating an actual "invisibility cloak". Very small metamaterials have been designed that can bend microwaves around a three dimensional object. Recently, the wavelengths it can bend have been widely broadened, hopefully to reach our visible light spectrum in the near future. This may very well be the first step in the design of an actual "invisibility cloak". Don't be checking eBay quite yet, it still may be a while.
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