How to use lines and shapes for better photos
Lines and shapes play an important role in photography. They can be used to guide the viewer's eye around an image. If used unwisely they can also guide the viewer's eye straight out of the image.
You can find lines in almost any scene, but it's how you compose your photo to make use of the lines that is important. Try to compose the shot so that the line(s) lead into the image.
The Grand Corridors @ Tanjore Brihadeeswara Temple by VinothChandar on flickr (licensed CC-BY)