The lens is actually made up of 4,000 "unit cells," tiny shapes that all bend radio waves slightly. Put enough of those together and you get the focused wave. When the MIT team tested out the process they found that the waves didn't get slowed down much by the material, either. That focus and efficiency, combined with the lens's light weight (less than a pound), means it could be ideal for use in imaging processes. The metamaterial might send radio waves to zero in on molecules, or go on top of satellites to guide the waves into the cosmos.