What really is here and now and what really is there and then?
According to Wikipedia:
Liminality (from the Latin word līmen, meaning "a threshold") is a psychological, neurological, or metaphysical subjective, conscious state of being on the "threshold" of or between two different existential planes . . .
People, places, or things may not complete a transition, or a transition between two states may not be fully possible. Those who remain in a state between two other states may become permanently liminal . . .
