Still, Dick is onto something. In those cases, the presence of Gandalf or the mirage still depends on people’s minds—their thoughts and experiences. If no one had ever thought about Gandalf, he would never have entered our lives. If we stop experiencing the mirage, it will go away. So we might say, “Reality is that which, when it’s not in anyone’s mind, doesn’t go away.” Or maybe better: “Reality is that which doesn’t depend on anyone’s mind for its existence.”