"I would say that the differences among media have a large impact on what sorts of interpretation - if any - make sense;"
In general I agree. although in my experience the differences between individual works seems to have a more significant impact on this than the difference between media.
"the fact that subjectivity does not automatically imply relativism, by itself, places no meaningful constraint and provides no meaningful guidance with respect to what is possible or reasonable."
You're right, not by itself it doesn't. But what it does do is protect you from a lot of the postmodern critics (the ones you hold in such low regard) who consider art to be nothing more than their raw material, and reality nothing more than an infinitely mouldable plaything. Fish's argument gives you a stepping off point for saying, "not so fast! Just because meaning isn't absolute doesn't mean it's whatever you say it is." And his theory (and others like it) do provide some framework for examining interpretations and lines of inquiry. I didn't get into all that because it's beyond the scope of a photo message board. But I'll say that I've found his ideas, in the broadest sense, to be very helpful when approaching many different art forms.
And Paul, you don't need to convince me of the differences between media. As a writer and musician and photographer, I know pretty well that I can't say in one medium what I can say in another. If you look higher in the thead, you'll see I already cited that Robert Frost quote.
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