The hemicircles are still too clever by half. We tend to judge the difference in the height of the facing edges, but a hemi that is twice the height of another

The hemicircles are still too clever by half. We tend to judge the difference in the height of the facing edges, but a hemi that is twice the height of another is actually 4 times the area. So an 80/20 split will appear to be more like 66/33 if you are not paying attention. On that page there is one stat with a 10/1 ratio, but at first glance it feels more like 4/1 or 5/1.