Our soul/god fragment must be some kind of projector. We seem to have a similar appearance in each incarnation. Some of the people on the USS Eldridge would phase out of existence or deproject when they returned from the Philadelphia Experiment. There's a type of duplication technology where they can copy a human with a holographic technique. I don't know if that's what Kent Dunn calls a hard hologram, but he claims they represent a percentage of the global population.