Story 2 - Doors?

There is no way out of this room I find myself in. In fact I don’t even see any doors or windows at all, but I’m sure there was a door when I came in, there had to be. But I look around and I do not see any way out. In fact, thinking about it I must have come in through a door, but there is none now. This is a real mystery, Maybe I am dreaming I can’t be in a room with no way out. 

Then just as I was starting to panic, a section of the room that was in shadow was lit up by a bright light from the ceiling and there in the corner was a concealed door. Finally I had a way to escape; I admit it, I was a little worried for a while. I got up and walked over to the door and it opened as I approached, but walking through I realized that I was then in a room identical to the one I just left and the door I came through was the only door in this room.