Martian - you experience sounds in a more rounded and complete way than most of the rest of us, right? I remember a thread where you described the colours of songs. That might be a bit like the way conversations and concepts swim in my mind as an ever-flowing imagery that is both important and difficult for me to express in visual art.
I think we all swim in seas of sensory overlap. And while we have congenital or experiential differences in how our various senses feed our inner understanding we also have external communication differences where what may appear to be the same language is not the same language - not until we have effectively communicated and understand just what our terms, language and definitions are.
We are a loooong way from dealing with the things our complicated minds form when we go through life. What people have done so far while making manifest our inner worlds reminds me of that conversation about "the things we know, the things we don't know, the things we know we don't know, and the things we don't know we don't know". The understandings of the future and the understandings of the past and the confusions of the present . . . a long swim in a sensory sea indeed.
Any point in this post? Probably not, but it served me to word it out and I tust no one will experience a tasteless, dull, dim ennui while delving into it