Paranormal Spotlight – The Cone Of Sound!
In November 2007, a six-story billboard was erected at the corner of Prince and Mulberry Streets in New York City. Behind the billboard were two directional audio (or audioSpotlights) which produce a highly focused beam of sound.
Passers-by who walked directly in the path of the sound would hear spooky, disembodied voices whispering suggestive messages such as “What’s that?” and “Who’s there? It’s not your imagination.” But someone standing next to that person would hear nothing. The billboard had a dramatic effect on people coming within range of the “cone of sound” created by the directional audio speakers.
The billboard was apparently the first commercial use of the technology on a billboard. A video of the installation can be seen here. 🌐