At an exhibition of modern art a crowd gathered round a picture called Cow Eating Grass.
From a distance it looked like a blank canvas so each person moved closer and closer, attempting to see something more.
Finally one woman said, “I can’t see any grass, am I missing something?”
The artist replied, “No, you’re right there is no grass, the cow’s eaten it.”
The woman peered at the canvas again and said, “I can’t see the cow, either.”
The artist replied, “You can’t expect a cow to hang round when there’s no more grass to eat.”