The audio sound beam. Both fascinating and disturbing.
Breaking all the rules of nature, the Hypersonic Sound Beam allows audio messages to literally travel through space in the shape of a flashlight beam. The sound remains invisible and silent, until the beam makes impact with the surface or person it has been meant to impact. At that precise point of impact, the sound waves disperse and the audio portion of the message magically becomes audible at that particular point.
Amazingly, visitors who enter or cross the invisible sound envelopes created by the Sound Beam will experience your message INSIDE THEIR HEAD; as if they were wearing headphones.