The analogy between pitch and color recognition is funny to me - it's like the skill gradient is backwards for artists versus musicians. One critical skill in learning to paint (naturalistically, at least) is learning to differentiate relative color, not absolute color. Learning to look at an apple and see warmer/cooler bits of red, for example. As the article points out, naming "red" is easy for most people, and then you spend years learning to mix all those funny shades in between.

There's a whole school of painters - after Edwin Dickinson, mostly - who talk about "color notes" and "color pitch". I wonder what the analogous cognitive processing skills are for artists.