As with the previous exercise on diagonals, curves can be used within an image to add direction and a sense of movement. Diagonals move through the frame from point to point and like straight lines are relatively easy to create by altering your viewpoint. A diagonal line dissects an image. It is a strong, hard graphical element within the frame that purposely leads the eye directly through the scene.
Curves on the other hand, although also adding a sense of movement and direction, can be weaved together to create a change in direction and encourage the eye to pause as it travels through the picture or in a certain direction. Curves are difficult to produce by altering viewpoint alone. Most will be "real" although not necessarily an object. They can be created by changes in light and shade e.g. in a landscape. Curves are softer, smooth and flow through an image.
Aperture Priority. ISO 200, 1/15 sec at f/11.
Aperture Priority. ISO 800, 1/13sec at f/16.
1/320 sec, ISO 400 at f/14.
These curves have been formed by the sea eroding away the layers of a rock.
Aperure Priority. ISO 400, 0.6 sec at f/11.
In this final image multiple curves create a far greater sense of movement. In all four images above the curves have been a strong visual element in the image and have been obvious to the viewer. I need to remember that curves can also be implied in an image in the same way as multiple points can become straight lines or other shapes and for future reference try to create images which still meet the brief but are less graphic in style.