Isn't it just a matter of listening to the ambient noise in your environment. open space sounds different to a closed room. if there is any noise around you can normally tell if you are near a wall just because one ear is getting a close echo from the wall, and the other isn't.

I think most people use sound all the time to orient themselves, especially in the dark. It's just that we are so fixated on what we see that using hearing to tell what is around you gets overloaded by the higher resolution information from our eyes.

I think I would be very interesting to see good research done with blind people to see how they use their senses. Is anybody aware of such research?