All people have invisible wings.
It is Gally and this emerging dream that brings life to the work. She is a small female cyborg discovered and named by Ido, a cyborg engineer who had found her head and part of her torso in a junk heap. Periodically, Zalem dumps garbage to the ground below, and it was in one of those mountains of trash that Gally had been found. Ido himself is an ex-inhabitant of Zalem, but won't speak of it. Gally, who has amnesia and can't recall who she was, lives happily with Ido for a while.