Why is "blue" in quotes in ggplot

[MCMaurer]

Should explain why color "blue" is in quotes, whereas variables are unquoted. Need to specify that the color here is a character string that R understands as representing a built-in color.

[MCMaurer]

The more I work on fitting this in, the more I realize it's a tricky aside. I think the balancing act is between leaving users with questions (why is this in quotes?) and confusing them with information that isn't relevant now (and saying "we'll talk more about this later").

I am leaning towards not explaining this- I think it could sidetrack more than help. Maybe mention later on "hey so remember seeing some stuff in quotes?"