Feelings of uniqueness may stem from fascination with one's own thoughts to the point where an adolescent believes that their thoughts or experiences are completely novel and unique when compared to the thoughts or experiences of others. This belief stems from the adolescent's inability to differentiate between the concern(s) of their thoughts from the thoughts of others, while simultaneously over-differentiating their feelings. Thus, an adolescent is likely to think that everyone else (the imaginary audience) is just as concerned with them as they are; while at the same time, this adolescent might believe that they are the only person who can possibly experience whatever feelings they might be experiencing at that particular time and that these experiences are unique to them. According to David Elkind (1967), an adolescent's intense focus on oneself as the center of attention is what ultimately gives rise to the belief that one is completely unique, and in turn, this may give rise to feelings of invulnerability. Ultimately, the two marked characteristics of personal fable are feelings of uniqueness and invulnerability. Or as David Elkind states, "this complex of beliefs in the uniqueness of (the adolescent's) feelings and of his or her immortality might be called a 'personal fable', a story which he or she tells himself and which is not true."