Interesting, especially when you think of how many people claim to have seen auras.* I wonder what effect diet has.
I used to do a lot of work in a darkroom, in complete blackout conditions. There were times when I could see some (but not all) of the objects in the room. Porcelain was fairly easy, the fiberglass sink a little less so, and so on. I hope that the porcelain didn't have a metabolism.