Symmetry is a sort of formal balance in which two parts of a piece of art mirror one another. This form of equilibrium is both familiar and prevalent. The human body, like our planet, automobiles, clothes, and furniture, is symmetrically balanced. So too are the components of a machine or an instrument.
In music, symmetry is the equal division into pairs of corresponding elements, such as pairs of syllables, notes, or phrases. Music is said to be symmetrical when it contains elements that can be divided into pairs that sound alike or relate to one another in some way. For example, the opening bars of Beethoven's Fifth Symphony are symmetrical, because they divide into pairs of identical notes: E-G-E-G-E-G. These eight notes are called the symphony's principal theme or root idea. It can be stated in general terms as a pair of identical sounds (or gestures) that are located opposite one another on the keyboard or elsewhere within the musical context.
The term "symmetrical" may also be applied to works of art that share certain qualities. Thus, a painting or sculpture is described as "symmetrical" if each part of the work is similar to or related directly to its counterpart. The human figure is often depicted as symmetrical because different parts of the body are in balance with one another.
The use of mirror images and repetition to produce balanced patterns and design components is referred to as symmetry. Balance is a visual effect that gives the appearance that designs are evenly weighted on all sides of their vertical center. Balance can be achieved by using equal numbers of shapes or elements that reflect back into each other (such as squares and diamonds), or by using different numbers of shapes or elements (such as more squares than diamonds). Elements used in design include lines, shapes, colors, textures, and materials.
In architecture, balance is the relationship between opposite faces of a building or other structure. The three most common types of balance are geometric, functional, and emotional. Geometric balance involves the use of identical elements on both sides of an axis line (for example, two pairs of lights on either side of a doorway). Functional balance takes into account the differences in size and location of various parts of an object. For example, a chair will appear balanced even though it has several sizes and styles of legs due to the fact that all the legs serve the same purpose - to provide support for the body. Emotional balance relates to the overall feeling produced by the design. For example, a room with geometric and emotional balances will seem stable despite changes in temperature or humidity because any one part of the room does not overwhelm the rest.
Balanced designs show up frequently in nature.
When sections of your composition mirror one other, this is referred to as symmetry. Consider the human body, which possesses vertical symmetry. The left and right halves are mirror images of each other. Consider taking a photograph and folding it in half. If both half of the image are identical, the image is symmetrical.
Symmetry is important in design. Without it, your image would be boring. Boring images get ignored by viewers so they understand that you do not care about your artwork or they would not interest someone enough to look at them longer. Boring images also tend to be abstract since there's nothing interesting about a blue circle with a white square inside of it.
In photography, symmetry can be achieved by photographing a scene from two different angles. This will result in two identical images of the subject. However, using multiple exposures or graphics programs can also create symmetrical images. For example, if you used Photoshop's warp tool on an image, you could generate many different versions of the photo where one side of the face was slightly distorted while the other side was completely normal. These types of images are called asymmetrical but still show symmetry because each side has something interesting going on it. In fact, any image that contains elements that catch the viewer's attention will have some form of symmetry in it.
As you can see, symmetry is very important in art and photography.