Researchers create the first 3D omnidirectional acoustic invisibility cloak

It might look like a quirky plastic model of an ancient Egyptian pyramid, but this model is in fact a 3D ‘acoustic cloak’, created using just a few perforated sheets of plastic. The device reroutes sound waves to create the impression that both the cloak and anything beneath it are not there. A refined version of the technology could one day be used for sonar avoidance and to refine noise in concert halls.