Very cool. Though I was stuck wondering whether or not "grey" is technically a color... So I found this:

"Grey (British English) or gray (American English; see spelling differences) is an intermediate color between black and white. It is a neutral or achromatic color, meaning literally that it is a color 'without color. It is the color of a cloud-covered sky, of ash and of lead" (Wiki)

Which is what I kind of guessed--a "color without color." That's sort of fascinating.. Grey (I went to grade school in England, leave me alone) is the mixture of both all the colors and the absence of them. It's like the "perfect medium;" a harmony, if you will, of presence and absence. Which is kind of strange if you think about the fact that "grey" is typically associated with being "drab," "dull," "mundane;" sort of "negative" traits--whereas, it is technically the "most perfect" color.