Figure 6.7 is "bad"

I think [Figure 6.7](https://clauswilke.com/dataviz/visualizing-amounts.html#fig:income-by-age-race-dodged) should have qualitative color scale unless there this gradual change in sequence Asian > white > Hispanic > black. (and also all should start with either lower or upper case letter).    

Alternatively the figure could be marked as *"bad"*.  