Ghostly Experiences and Fourth Dimension

Carl Sagan (one of my heroes along with da Vinci and Tesla) does a fine job of explaining something that makes me the afterlife the fourth dimension? If the 2nd dimension is what we use to conceptualize things we will make, like drawing a picture of a machine before building it, then are we in third dimension a conceptual piece for a reality in the fourth dimension?

Something to ponder.