Writing about critical elections made me aware of how difficult it is to describe all the different political parties that have existed in the US over time. So I was fascinated to discover this firm, called HistoryShots, that makes some pretty remarkable graphical representations. The one that caught my eye is a snaky-looking thing showing the tortuous history of the political parties, but there are others with titles like “The Genealogy of Pop and Rock Music” and “The History of Dow-Jones Industrials.”