N. Stenger et al., Phys. Rev. Lett. (2012)

Figure 1: A device for cloaking an object from elastic waves in a flexible medium. (a) The cloaking ring designed by Stenger et al. consists of concentric rings of a hard plastic, punctured with holes that are filled with a softer silicone-based material. (b) Images of $200Hz$ elastic waves passing around an inclusion (dark circle). Without the cloak (left), the waves break up; with the cloak (right), shown here by a dotted line, the waves pass by mostly undisturbed. (The white scale bar is 5 cm.)