Insufficiency and illusions by Kaiser Fung.
From the post:
This WSJ graphic gives me a reason to talk about the self-sufficiency test: go ahead, and block out the data labels on the chart, you are left with concentric circles but no way to learn anything from the chart, not the absolute dollar values, nor the relative dollar values. In other words, the only way to read this chart is to look at the data labels.
Kaiser illustrates visuals that don’t really work as visuals.
Follow the “self-sufficiency test” link for a collection of poorly designed (not evil) graphics.