SPS

Following the couple of ideas i had earlier, i decided to consider mapping but with sound..
basically, the SPS: Sound Positioning System.
A specific (very specific) location will have one 'key' at a specific (again, very specific) time.

So for example, at [12:10 sitting at the far end table at the LCC canteen] would be a 'key'.
Because sound/noise is everywhere/every time it is quite hard to map, although i guess conceptually it'll be visually pleasing and entertaining.
The SPS could even be adapted to, for example, blind people: including braille on the key and having a couple of keys for the blind persons direct environment..