Toward Ecosophy

Does make me wonder, though. How do ghosts travel around? I recall that when my father died a few years ago, within minutes of his passing, my youngest niece (then 6 years old) felt someone tap her on the shoulder, but no one (visible) was near enough to have tapped her. My family mostly thinks this was my father's spirit because of the timing, and also some later experiences where he briefly appeared to my mother, and later she heard his voice call to her from the vicinity of his favorite chair in the living room. Do we know much about how those without the mortal coil travel or move about? From my family's experience, as well as some other stories, they seem to be able to transport themselves from one location to another with little or no travel time.