Information Aesthetics points to an interesting visualization of the "informational" relation between cities. Two cities are "informationally" related if they are often mentioned together, so the visualization uses the number of Google results to approximate the distance:
Gdistance(w1,w2) = (#(w1)+#(w2)) / (#(w1+" and "+w2)+#(w2+" and "+w1)),
where #(w) is the number of Google search results for the query w enclosed in quotes.
This approximation could be improved by replacing "and" with "*", so that the words aren't necessarily separated by the conjunction "and". The Google distance is multiplied with the physical distance between cities to increase the connection between cities that are far away.
Among the cities that have a small "informational" distance: London and New York, Tokio and Sydney, London and Singapore City.
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