Sometimes the apparition is a function of the natural world.
We don’t see things as they are. We see things as they were. Even within our own body, the further apart something is from our mind, the further away from us in time that it is.
So if you are standing across from me, I see you as you were, say, a billionth of a second ago.
If you’re a far away star, you no longer exist and yet I see.
The apparition exists because of a relationship.