When we die and shed the physical body, we usually live on in a Quantum body for a few days.
Itís like a template of the physical body, and we enjoy a lightness of being. Itís as though a big burden of physical living has been lifted from our shoulders. Our memories of earth life are still fresh in our mind, so we take the opportunity to tie up loose ends. We might visit our family and say a quiet good-bye. Weíre now in our spirit body, and we can see them, but they usually canít see us. Sometimes our loved ones on Earth can see a shadow movement out of the corner of their eye, and they might feel our presence.
The Quantum body is a very dense spirit body that we on Earth sometimes equate with ghosts and apparitions.