When Confucius traveled east, he saw two children arguing and asked them why they were arguing. A child said, "I think the sun is close to people when it just rises, and far away at noon." Another child said, "I think when the sun just rises, it is far away from people, and at noon it is close to people." A child said, "The sun is as big as an umbrella at the beginning of sunrise, and it is as small as a plate at noon. Isn't that the reason why things look smaller if they are far, and bi...