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This is called ‘the rule of thirds’, and has been used as a standard of visual beauty in art
for centuries. Many of the world’s most famous paintings are based on this rule.
See below for a more detailed demonstration of the rule of thirds.
The Rule of Thirds
(
http://www.hippasus.com/resources/viscomp/RuleThirds.html)
For the rule of thirds, imaginary lines are drawn dividing the image into thirds. The most important
elements are placed where these lines intersect
(see diagram a.)
In addition to using the
intersections, it also helps to use a 2 to 1 ratio (thus dividing the image both horizontally and
vertically into thirds) so that nothing is dead centre, which makes for a static image. Instead, when
placing the horizon line of a landscape, or the eye line of a person, use the lower or upper third as
an approximate guide.
diagram a