sentences:  These conditions are usually in some way related to the inherent meaninglessness or absurdity of the earth and its apparent contrast with our pre-reflexive lived lives which normally present themselves to us as meaningful.A central theme is that since the world "in-itself" is absurd, that is, not "fair", then a meaningful life can at any point suddenly lose all its meaning.The reasons why this happens are many, ranging from a tragedy that "tears a person's world apart", to the results of an honest inquiry into one's own existence.