What would life be like if no one acknowledged your existence? The question confronts one with the possibility of being isolated, marginalized, ignored, and forgotten by others. The unacknowledged find themselves in an out-of-the-way place where it is hard or human beings, given their social instinct, to feel at home. The suffering that can accompany this way of being-in-the-world is known to bring about fear, anxiety, sadness, anger, and sometimes...