I'd like a Sankey diagram approach to mapping general history. Unclear what the flow variable should be though. Some proxy for 'life energy'
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Well you only get a couple of dimensions to work with anyway. Is "life energy" one of the 2 or 3 most salient measurements in history?
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I had one of these for empires when I was a kid. I don’t know how the author picked the flow variable. Maybe it was land or population
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