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    $\begingroup$ For those who have difficulty distinguishing red and green: the green classifier is given by the very wiggly line separating red and blue data points. $\endgroup$
    – Nick Cox
    Commented Mar 2, 2020 at 7:07
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    $\begingroup$ @NickCox The image is perfectly understandable even in black and white. $\endgroup$
    – user76284
    Commented Mar 4, 2020 at 17:15
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    $\begingroup$ @user76284 Sure, if and only if you are told, or you take it on trust, that the wiggly line is a perfect classifier and the smooth line is not. The point is that OP chose red and green when there's a politer and more inclusive way to use colours. Gee, this thread is supposed to be about "very clear" examples but deficient examples qualify? I would be happy with e.g. circles and pluses in black and white, but that is not what is on offer. $\endgroup$
    – Nick Cox
    Commented Mar 4, 2020 at 17:58
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    $\begingroup$ For all those reflexively assuming that this won't work for people with colour blindness, perhaps try examining it in a colour blindness simulator first, such as at color-blindness.com/coblis-color-blindness-simulator That shows that this image actually works pretty well under most forms of colour blindness - there are other dimensions of colour perception beyond hue which allow the colours in this image to be distinguished easily, even when the subjective appearance differs substantially. $\endgroup$
    – Michael MacAskill
    Commented Mar 5, 2020 at 3:52
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    $\begingroup$ @MichaelMacAskill You're right, and for example I am not assuming that it "won't work" for any group of people. I am just saying that the design could be improved in small but helpful and inclusive ways. The point is about graphical etiquette as much as anything else. I don't mind people regarding this as a small point, as it is, but I think it's still worth making. Your saying that it works "pretty well" I take to mean that your view is close to mine; you didn't say "excellently". $\endgroup$
    – Nick Cox
    Commented Mar 5, 2020 at 15:49