Arthur Schopenhauer (1788-1860) said "Every man takes the limits of his own field of vision for the limits of the world." This is very true because we analyze and experience our surroundings based on what we already know. If someone has never seen an airplane in his/her life, the first time they see a plane flying through the air, they're going to assume that it's a bird...because they don't know any better.
This is why I always say that it is very important for everyone to read or travel so you experience different things and as a result your world will grow exponentially. From personal experience, I have found that individuals who do not travel outside of their immediate surroundings or read whether its books, blogs, magazines, etc, their ideas about the world and how it works are so closed minded and they have a very hard time seeing things from a perspective different then their own.
So the lesson of the day is to travel--or read, it's the cheaper alternative!