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A metamaterial cloak, however, causes the light bouncing off it to perfectly cancel the light reflected from the object underneath it, producing undisturbed light waves that conceal the object's presence (right). Several research teams around the world, including mine, have de sign ed and produced metamaterial coatings that can redirect light waves that hit them, effectively preventing light from bouncing off the object and reaching our eyes and even from leaving shadows. The emerging light-matter interactions are controlled by the twisted symmetry of the crystal lattice, en ab ling a large rotation of the incoming light polarization over a broad range of wavelengths. [Extracted from the article]