[Erin Pavlina]

Yes I'll add an experience here.

One time during an astral projection I took note of my nightstand next to my bed. I saw my lamp, the clock, my kleenex box, but I could not see my water glass. I knew my water glass should be there, but try as I might, I couldn't see it. I don't know why I could see the other items and not the glass. Perhaps it was simply harder to see in the dark since it's transparent, but I've always wondered about that.