My last three Project 365 photos have been themed around "yellow". The first two inadvertently, and the last intentionally.
Round Lamp, Yellow Wall:

This is not a yellow truck:

This is a Yellow truck.
Why am I yellow?

I figured I'd continue with the yellow theme of my last two photos.
So I can understand where the terms "black" and "white" come from. One's darker, one lighter. I can even understand "brown". "Red", a little less so. But I've never understood "yellow".
Okay, so this notepad isn't the world's greatest example of yellow, but still, compared to my arm, one is clearly yellow, and one is clearly not. Even compared to other people, how am I more "yellow"? If I'm in between "black" and "white", why not "gray"? :P For that matter, I'm clearly more "orange" than "yellow".
In all seriousness, though, I actually really am quite curious about the origins of using "yellow" to refer to East Asians. I wonder if it had anything to do with the "cowardice" definition? That is, I wonder if "yellow" was originally meant as a derogatory term. Did it originate with the term "Yellow Peril", or did it predate that?