The Rule of Thirds is a very general photographic guideline that
suggests dividing a photo into horizontal and vertical thirds, then
composing to put the critical elements of the photograph at the
intersection of the imaginary thirds. Look at the example below:

The rule of thirds concept is illustrated in the photo
by the grid lines and the placement of the model within the compositional
framework. Putting the subject or important elements of the subject
near the intersection of these grid lines helps to lead the viewer's
eye through the frame and creates an aesthetically strong image.
The placement need not be exact.

In the above image, the photographic elements are
not at the exact intersection, but the eye is still lead through
the frame and the composition is effective (though helped by the
strong diagonal lineof the model's back). There is yet another example
below:

As with all rules, the Rule of Thirds can and should
be broken when required. An example would be when photographing
strongly symetrical subjects, such as in the photos below:


Nevertheless, the Rule of Thirds can be a very effective
compositional tool when used correctly. It can emphasize action:

And it can help lead the eye to the critical elements
of the photograph:

|