Researchers have \”cloaked\” a three-dimensional object, making it invisible from all angles, for the first time.
However, the demonstration works only for waves in the microwave region of the electromagnetic spectrum.
It uses a shell of what are known as plasmonic materials; they present a \”photo negative\” of the object being cloaked, effectively cancelling it out.
http://www.bbc.co.uk/news/science-environment-16726609