Illusion Cloak Makes One Object Look like Another

Just when you thought invisibility cloaks couldn’t get any weirder, researchers come up with this: a way to make one object look like any other. Invisibility cloaks work by steering light around a region of space, making any object inside that region invisible. In effect, an invisibility cloak creates the illusion of free space. This is possible because of a new generation of artificial materials called metamaterials that can, in principle at least, steer light in any way imaginable. Indeed, various teams have built real invisibility cloaks that hide objects from view in both the microwave and optical bands. Now Che Chan and pals from the Hong Kong University of Science and Technology say that metamaterials could be used for an even more exotic effect: for cloaks that create the illusion that a different object is present

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