As a wee boy at school I painted a Bobby with a purple uniform and the art teacher was most complimentary about it, "Shows wonderful imagination" and all that guff. The other kids thought I was barmy, and when I realised , I thought I was stupid. Maybe everyone was right.

In an emergency, and against my better judgement, when I was in motor assembly quality control, I have done paint rectification inspection. I rejected just as many as the regular inspector, and got no comebacks.
Shades rule OK. Due to experience, I still spot a lot more paint faults than my normally colour perceiving wife.