Um... Mountain range is one word in your legend. I think the white stroke around many of your labels is a little overwhelming, especially the gray ones.

Other than that, it's a thing of beauty.

I am tempted to thnk that the symbolic complexity is too great, but there is no reason to assume that the human capacity to interpret symbols will remain the same into the future. After all, in St. Augustine's time, it was not commonplace for even a highly educated person to be able to read silently. (At one point in his Confessions, Augustine expresses surprise that one of his colleagues can read without saying the words aloud--the man was still moving his lips, though.) So it seems likely that human mental function might change to accommodate the huge number of signs and symbols we are generating today.