In the very near future holographic technologies and imagery will be refined to the point that you will think you're seeing ghosts. In the past you may have seen an image or a ghost and considered such an act of God or something supernatural. But in the future it will merely be one of the latest technologies.

In fact, Wal-Mart may opt to save money on their greeter at the door with a little illusionary presence and holographic imagery. The ghost greeter will say;