In his recent Gizmodo article, "Why We Need Audiophiles," John Mahoney ventured:
Audiophiles are basically synesthesiacs. They "see" music in three-dimensional visual space. You close your eyes in Fremer's chair, and you can perceive a detailed 3D matrix of sound, with each element occupying its own special space in the air.
A couple of days ago, there was a fascinating article in Scientific American on synesthesia, its origins and uses.
Today, we know that far from being rare, synesthesia is common