Money Maps

Some kind of theoretical physicist used data collected from WheresGeorge.com to create a map of how our money moves, hence how we move. The darker blue the line, the less likely a dollar bill is to cross it. How do we understand these lines? The map's creator suggests they can be used to create new state boundaries based not on arbitrary frontiers but on actual social and economic affinities. For me, it's awesome to see how much rivers, specifically the Mississippi, still help shape human mobility. Also how little Florida - or New England - wants anything to do with the rest of us. More pictures here.