Hey, I'm just curious if anyone has designed a device that can direct and concentrate sound waves like a parabolic mirror? Since both sound and light are waves, I assume there must be a shape that allows one to "target sound" much like using a magnifying glass to focus light. On a related note: I remember seeing on TV many years ago (military weapons documentary I believe) that an engineer developed a device which can direct sound waves in a laser-like fashion. I've tried doing some Google searches with no luck. Anybody know where I can find some information as to how this device works? Thanks.