I took a series of shots to demonstrate just this point at a workshop at my camera club.
In this series the position of the camera is unchanged - the shots have just been cropped to render the image
the same size (in the case of the 35 mm shot it has had to be up sampled hence the image degradation). You can
clearly see that the relationship between the foregroud cross and the gravestone in the background remains unchanged
IMG_4178.jpg
Where as in this series of shots the camera has been moved to maintain the size of the foreground cross in the image
frame. Now you can see the change of perspective brought about by moving the position of the camera.
IMG_4175.jpg
Hope this helps