Density

Last week Andrew Gelman labeled the above bar graph his "graph of the year" because of its ordinariness: 

Bill James (and others) have pointed out that true racial equality in baseball came, not when superstars such as Jackie Robinson and Willie Mays started joining major league rosters, but when there was room for ordinary black players to join their equally unexceptional white colleagues on the bench. Similarly, graphical methods have truly arrived when journalists use graphs to make ordinary, unexceptional points in a clearer way.

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