These are from ancient Greece, rooms for gazing at the dead. In that day, it was a room where people would stare into reflective surfaces such as oil or water.
Today, it is a room you can build with mirrors (the darker, the better). It’s suppose to be done at twilight or sunset, with the person in a comfortable nearly mediative state. A low light source like a red light or candle with a little smoke is the conditions to make it work. Some say it brings back memories, others say it’s your long lost relatives.
I am curious if anyone has ever tried this?