Or, at least it's migration.
Fascinating video showing where influential people were born and then died. Interesting to see which places have acted as sources and sinks for great minds through history. For example ancient Rome draws people in while in the early 1900s most european cities appear to be exporters of notable people - especially London, while Paris remains an attractive destination.
Obviously some big biasses as to who is considered "notable" in here but still fascinating.
Schich and his team took data on more than 100,000 notable figures—people important enough to have their births and deaths catalogued—from Google’s information tank, Freebase, and digitally plotted it on a map visualizing changes over hundreds of years. Blue dots signify births, red dots mark deaths. The more dots in a given location, the bigger the visualization. The result is a mesmerizing, animated timeline tracking the geography of culture and the origins of the hub contributors.