Aleks points us to this beautiful dynamic graph by Noah Veltman showing the heights and weights of NFL players over time. The color is pretty but I think I’d prefer something simpler, just one dot per player (with some jittering to handle the discrete reporting of heights and weights). In any case, it’s a great graph. Click on the link to see it in action.
P.S. Even better, once we move to a dynamic scatterplot, would be to use different colors for different positions, and to allow the reader of the graph to highlight different positions. On the linked page, Veltman writes, “the blob separating into multiple groups in the 1990s . . . likely reflects increased specialization of body type by position.” But we should be able to see this directly, no need for speculation, right?