The fact of the matter is that I have recently started turning first my Kowa Six and now the Mamiya RB that has replaced the Kowa sideways from front to back (vertically) to shoot straight up at ceilings. Only on a tripod, mind you. A waist-level is perfect for this, too. I was just stumped at turning a 6x6 sideways for a horizontal shot and wasn't thinking about other formats. Mea Culpa.