The self-portrait of van Gogh hanging in Oslo’s National Gallery is now considered a fake. But the news hasn’t proved to be a liability. “The painting of a troubled face on a blue-green background is the only portrait of van Gogh after he cut off his left ear. Visits have nearly tripled at the National since the van Gogh came home, and it had the same effect in Italy where it was on loan when the controversy over the painting’s origin erupted.”