A line is a contour or outline considered as a feature of design or composition. In photography, lines that lead to the subject usually bring the viewer back to that area of interest. Lines are important because they, along with points and shapes, are a fundamental geometric element. Under traditional composition theory, the lines in an image direct the viewer’s attention to the interesting parts of the image. Lines are also supposed to be important because they contribute to the sense of mood in a photograph. According to tradition, horizontal lines are associated with serenity, vertical lines are associated with strength, and diagonal lines tend to be associated with dynamism. When used in the context of graphic design, these principles may hold up for images with a few simple elements. However, most photographs have lines running at multiple angles and obtain their sense of mood or expression from factors other than the orientation of their lines.