[msellout]

Circles in circles is a terrible chart. Humans have a very difficult time comparing relative areas of circles.

Much better would be to add a separate bar chart comparing all the countries and each bar separated into stripes for the city vs total. Perhaps on a log scale.

The chart they made might be more beautiful, but it's less informative.

[mirimir]

> Humans have a very difficult time comparing relative areas of circles.

Area ~ diameter^2 so ...

But maybe too abstract.

[collyw]

When you are talking about comparing charts, I think he means visually, not mathematically.