well, a search on " synaesthesia" gets LOTS of hits..it seems to have various forms and not be that rare.....and I'd bet my boots that it is related to many instances of visions, religious experiences, mental illness etc. throught the years! (wonder what kids with autism are hearing, tasting, seeing when they try to cope with the world!)

why do we not hear (or taste) more about this? (well, if you do that search, you WILL..