The Door: NO CUTS between the occultists' blue room and the stationery cupboard

I find the best movies have great practical effects, and this movie shows two shots that transition between a large blue room with cobwebs beyond an ornate door, and a small stationery cupboard that replaces it when the door is not active, so to speak.

True, having the camera there when the door is closed on the blue room is easy enough to have stage hands move the stationery cupboard into place before the door is opened again, but I still think it's a great couple of shots when it happens twice.