Intellectual Network Effects

John Scalzi writes:

I do get occasionally amused at being a poster child for Science Fiction’s Digital Future when I live in a rural town of 1,800 people with agricultural fields directly to my east, south and west, and Amish buggies clopping down the road on a daily basis. It’s, like, three cheers for cognitive dissonance.

I responded in the comments:

I would have had exactly the opposite reaction, that your situation is entirely representative.  For 500 years, from the Italian Renaissance through the 20th century, intellectual thought moved forward mainly hand in hand with urbanization.  I am not really an expert in describing the ins and outs of this, but there is clearly a density and network effect to intellectual advancement, and given past communication approaches, this required physical proximity.  The promise of modern IT technology is that it may allow us to achieve this density without physical proximity.