'The Invention of Paint'

Once upon a time we were all made out of clay
With two arms, two legs, two hands
We just came out that way
And as you can see from the sands of time
Colours merge in folds of iron
Even now I see five shades of dirt like abstract art upon the horizon
But then they segregated out the yellow
Construing an illusion
And now we're either black or white
And bleed into confusion