Long answer: Let's say that you are not a human being having a spiritual experience, you are a spiritual being having a human experience. So, part of all of us can be on this nonphysical other side. Some people have friends, even families, parents, children, or lovers on the other side. Some are from past lives. Some might be walk-ins to corporeal people in the present life. If you read Carl Jung's books, you might find that he would interpret some of those friends as shards of our own souls and psyche, that the psyche is as vast as a world.