What is the sigificance of Peter Paul Ruben’s painting, the Four Continents? What does it represent?

What is the sigificance of Peter Paul Ruben’s painting, the Four Continents? What does it represent?\

What is the sigificance of Peter Paul Ruben’s painting, the Four Continents? What does it represent?
What is the sigificance of Peter Paul Ruben’s painting, the Four Continents? What does it represent?\