10 Impressive And Crazy Things Related To Sound
The military has been working on the Long Range Acoustic Device for quite some time, which basically is a black spotlight capable of shooting a beam of sound for hundreds of meters. The beam is used for crowd control, mostly.
Transferring sound waves to a visible medium, such as a piece of artwork, is completely possible and being done by a variety of artists. Galileo used this in 1632. Using sound waves, you can produce symmetrical artwork and patterns.