 Meinong was concerned about the problem of intentional states which are not directed at anything existent. The starting point of this problem is the so-called “principle of intentionality”, which says that mental phenomena are characterized by an “intentional directedness” towards an object. For instance, to love is always to love something, to imagine is always to imagine something, and so forth. In other words, every intentional act is “about” something. The problem is that sometimes people imagine, desire or fear things that do not exist. Some people fear the devil, although the devil doesn’t exist. Many people hope for peace in the Middle East. But there is no peace in the Middle East. Ponce the Leon searched for the fountain of youth, even though it doesn’t exist. It is easy to imagine a golden mountain, even if no such thing exists.