Sleeping nook with reclaimed windows as doors. I deeply love this - I've always found the cubby/fort/hideout space very comforting. I like bunk beds, the bottom bunk, because they give one a sense of that. Though as a 6'3" adult, sleeping in the bottom bunk is not all that doable. Twice I've lived with my bed in a closet - this is just a much classier version of that.