Mike Bostock knows far more about data visualization than I do so I assume there are good reasons for choosing this presentation. But it strikes me as hard to think about, so I must ask: when is stacked+packed circles a good choice? The drawbacks to me seem to be: - At any given point on the x-axis, the associated height of the pile is partly taken up by circles but is partly space lost to circle packing. This propor…
It is the total volume of money involved vs the count. The height of both stacks show just how much damage three did vs all the others in the left hand stack.