Voices in my head. Awesome?
The billboard uses technology manufactured by Holosonic that transmits an “audio spotlight” from a rooftop speaker so that the sound is contained within your cranium.
In other news, a good discussion of Pot Paranoia on Ask Metafilter. via µ-slabs, who is baked right now. From commenter mayfly wake:
My personal theory is, like most psychedelics, it overactivates the pattern-recognition part of your brain.
Apophenia! (Or is it? Why is that kid staring at me?)
