The Diagonal Line is a line of energy and movement. It is a line that slices diagonally through an image and leads the eye into the frame. You can use them to create a strong impression of movement or you can use them to create a tremendous sense of depth.
Starting a Photographic Project is a way to invest in a personal exploration of a subject. As a landscape photographer I travel quite extensively to some far flung places around the United States. Chasing light and capturing the grandeur of the American landscape might, by some, be considered a project but in my way of thinking it is not really the same thing.
Lines are one of the most basic elements we have in creating a photograph. Lines can be horizontal, vertical, diagonal, S-shaped, and even implied. Obviously a photograph can be made up of more than one kind of line. And additionally there are other elements such as light and shadow, shapes, colors, contrast, texture, and tonal values that all contribute to the final image.