Invisibility cloaking, metamaterial.

A team led by scientists at Duke University’s Pratt School of Engineering has demonstrated the first working “invisibility cloak.” The cloak deflects microwave beams so they flow around a “hidden” object inside with little distortion, making it appear almost as if nothing were there at all.
[Schurig et al., SCIENCE VOL 314, 977-980, 2006]

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