What's the difference?

John and I were riding the Red Line train downtown and it was just us and a homeless man on our car. The homeless man is drinking whiskey from a brown bag. He looks over at us and says, "Hey, I gotsa question. Me and my buddies been thinkin' bout this and I've just been wonderin'....but what is the difference between the "Earth" and the "World"? John and I just looked at him for a second...trying to think of a way to explain this to him...and he continues, "I mean, here's the way I see it. You're comin' in from outer space, right? And you're flyin' through the air...and first you're lookin' at "the earth", you know?...And then...you come insiiiide....and then you're in "the world"...Yeah man, that's the way I see it...That's the way I see it, for sure."

At least he's thinking....at least he's thinking.