Take a good long look at this map of Germany, with the colours of each area mapping the incidence of something - yellow meaning less, red meaning more. Very clearly, we can see the colours highlight the old West and east Germany, made clearer by the green line. Do the hot spots map political opinion? Does the map represent the preference for a particular type of German suasage? Or, just maybe, this is a map that calculates the likelihood of finding relics of the Stazi (old german state police)