So… if I put a tag on a Flickr photo that says “Washington Square, New York City”, but it’s actually on one of the side streets near Washington Square… then Washington Square’s neighborhood, its alpha shape, gets a little bit bigger?

That’s kind of cool. When you take the aggregate of all such photos, then, you’re building a kind of fuzzy map, in which a “cloud of witnesses”, to use Dorothy Sayers’ phrase, set the generally-agreed-upon boundaries of a region…

Hmmm. That’s almost human.