This may seem like a no-brainer, but I don't think I completely grokked this until I read about it and then practiced it. In Ansel Adams' book The Camera, there's a great chapter called Basic Image Management. He's discussing camera position and distance related to the subject and how that informs perspective. The thing that I did not really realize is that taking your camera and walking closer to your subject produces very a different effect than zooming in on a subject. So, as Ansel so eloquently explains, "perspective is a function of camera-to-subject distance." Duh. Because I've almost always got a zoom lens attached to my camera, I tended to zoom-in or out for the desired effect. Now I know that is not always the right way to go about it. I practiced this on many subjects, but this post illustrates it well.