Using rear movements (rise/fall) to correct perspective
Certain cameras allow for a digital back to move up and down, and left and right, while leaving the lens in exactly the same position. Among other things, this is a great tool for correcting perspective in images.
Commonly when photographing buildings or monuments we have to point the camera up to fit the whole building in the frame: the un-wanted result is the building looks like it is falling backwards.
This is what happened in the first of the images here.
In the middle image we returned the camera to pointing exactly level, preserving the correct upright look of the building and the surrounds.
Finally in the last photograph we moved the digital back until we could capture the desired image. The lens didn't move at all between the second and third image, creating a fixed projection of the scene. Because lenses invert the scene (upside-down, left-to-right) we actually had to lower the back downwards to capture the top of the building.