Not all maps are written on paper. When trying to reach the refrigerator at night, we do not smell our way to food, we use a map based on our memory of the room. If we stumble on our way, it is usually over a misplaced toy or shoe that we did not remember leaving there. Everyone has these kinds of maps in his or her mind. These mental maps help you find your way not only to the refrigerator in the dark, but also to the grocery store and to work. People not only have mental maps of common trips they make, but also of their city, country, and even the world. Every person’s mental map is unique, based on how wide an area that person travels and their knowledge of the world.