Every perception a person has is based upon their own personal experience. People perceive the world differently because no two people have the same experiences. Experience makes us who we are. It shapes our minds and opinions, our likes and dislikes. Therefore, it is difficult to have one ideal definition of certain concepts, such as justice, virtue, and an ideal society. Our experiences color our opinions of people different than ourselves and even our opinion of the dark. The only way to create one perception of reality would be to systematically force everyone to have the same experiences. Fortunately, by using the kind of perception checking skills explored earlier, we can do our best to understand how others are experiencing the world and we can avoid misinterpreting their behavior.