At an art gallery, among other works of art, there is a painting by a famous painter.
The entire painting is completely black. Surprised by what he saw, a visitor asks him:
“What does this painting represent? I do not understand anything!”
“You are one of those people who don’t seem to understand art. It’s nothing, I’ll explain: the painting represents a black man stealing coals at night. “
This joke is included in the Black Book of Jokes. You can order it from here.