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Art

As Xan points out, a weakness of this viz is that it invites interpretation as a stacked bar. The fact that the vertical ordinal ranking applies only to the leftmost cells, while the order of everything to the right is just an artifact of the tiling algorithm, creates confusion.

I confess I'm not a fan of treemaps. At least the axes of a treemap have no pretension to numeric value. Here the vertical axis conveys size ranking for some of the leaves but not for the others. It seems to violate some cardinal principle of good design.

James

Can I meekly raise my hand, about the consistency of the data in the second chart?

I happen to live in Hennepin County in MN. Is it really possible that Hennepin County's 1,232,483 souls has more voters than the 2,333,054 folks in Queens County, NY?

That aside, I think the chart type is good. I like the sense of the total it gives.

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