This episode explains that placing north at the top of maps is not a natural rule but a historical convention. In the ancient world, maps were oriented in many different ways. Some civilizations placed east at the top because of the rising sun and religious beliefs, while others, including traditional Chinese and some Islamic mapmakers, often placed south at the top to reflect their own cultural and political perspectives.

The north-up convention became widespread during the Age of Exploration, when European sailors relied on the magnetic compass for navigation. Because compasses consistently pointed north, aligning maps with the compass made navigation simpler and more practical. As European mapmaking and printing spread around the world, this orientation gradually became the global standard.

The episode also explores how map orientation influences human perception. Many people unconsciously associate “up” with importance or superiority, even though Earth has no true top or bottom in space. In the end, north appears at the top of modern maps not because nature demands it, but because centuries of navigation, technology, culture, and shared convention made it the most widely accepted way to represent the world.