First, Adam, I'm glad to know that you're still alive.
Secondly, it is extremely difficult to ascertain exactly what it is you're asking. I'm not going to even attempt any but your first question, and I am far from sure about even that one. But I will try to re-state it; if you would be so kind as to post whether my summary is correct or not (and correct it if it is not, please), then perhaps someone who actually has the knowledge (I do not) to answer your question will respond.
I
think you are asking if there is a term for when the message of a piece of art is not simply what it says, but also how it was done and maybe even its medium.
I am not clear on what your reference to ASCII means. If you were asking whether there should be a difference in interpretation depending on whether the same message was done in calligraphy or in ASCII, then my above paragraph is incorrect.
