The compositional concept of leading lines is a classic one in both art and photography, and it serves an important purpose. It draws the eye into the center of a picture, and that's usually where the subject or at least the interest is. In this case, the pier in south Florida is the leading line. Note I used complete depth of field in this shot. I feel that's very important for virtually all leading lines. That means, of course, that a tripod is essential so you can use a small lens aperture like f/22 or f/32 without worring about the speed of the shutter. In muted light circumstances, like the cloudy day I had to work with, the shutter is going to be slow. A tripod guarantees a sharp picture througout.