Three men painting?

a couple r on honey moon in paris and are walking through the art gallery...they come across a rather odd paining, and stare for a short time to try and understand the painting...the painting is of three dark skined males , and the middle man has a white ...the curator aproches them and explains that it is a painting about racism, and inter race . when he leaves a scotish man walks up and tells them that the curator doesnt no what hes talking about...the couple ask why he thinks he knows more about the painting than the gallery curator, and he explains that he infact painted the picture...he says "they are three cole miners, and the middle man went home for lunch!"