Rule of thirds
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The rule of thirds is a compositional rule of thumb in photography.
The rule states that an image can be divided into nine equal parts by two equally-spaced horizontal lines and two equally-spaced vertical lines. The four points formed by the intersections of these lines can be used to align features in the photograph. Proponents of this technique claim that aligning a photograph with these points creates more tension, energy and interest in the photo than simply centering the feature would.
The photograph of the cuttlefish to the right is an excellent example of the rule of thirds. First, both cuttlefish are positioned where two lines intersect, sometimes called the "power points", as denoted by the yellow circles. Second, the right cuttlefish's right tentacle (our left) is lined up with the lower horizontal line, highlighted in yellow. Subjects in the photograph don't have to hit a line to take advantage of the rule of thirds, however. Notice that the rock formation in the background moves diagonally from section A1 to C3, along the dotted yellow line. Lastly, note the right cuttlefish's left tentacles (our right) flow down the far right column from section C1 to C3 (highlighted in yellow).
The application of the rule of thirds to photographs is considered by many to make them more aesthetic and professional. The rule of thirds can be applied by lining up subjects with the guiding lines, placing the horizon on the top or bottom line instead of the center, or allowing the subject(s) to flow from section to section, as is done with the example photograph.
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