Who and what are the Shadow Citizens?
They are the people who are unheard of, unrecognized and obscured. In extreme cases they may be in hiding, in isolation, or they could be ambivalent or apathetic about human contact. They are citizens who have no voice, no presence, and do not appear. In normal situations, they may be people who wish to retain a greater degree of privacy, or do not engage outside of a small group.
They are people who could be citizens, would be citizens, or were citizens. For whatever reason they are in the shadows, barely seen, invisible, through lack of participation in the public sphere. They may have friends and family, but they seek and find obscurity.