Now, to use the famous metaphor by Alfred Korzybski in his Science and Sanity (1933), this verbal world ought to stand in relation to the extensional world as a map does to the territory it is supposed to represent. If a child grows to adulthood with a verbal world in his head which corresponds fairly closely to the extensional world that he finds around him in his widening experience, he is in relatively small danger of being shocked or hurt by what he finds, because his verbal world has told him what, more or less, to expect. He is prepared for life. If, however, he grows up with a false map in his head [...] he will constantly be running into trouble, wasting his efforts, and acting like a fool. He will not be adjusted to the world as it is: he may, if the lack of adjustment is serious, end up in a mental hospital. (editor's link)