Principles of art
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The principles of visual art are the rules, tools and/or guidelines that artists use to organize the elements of art in an artwork. When successfully combined with the elements of art they aid in creating an aesthetically pleasing or interesting work of art. Some principles of art that have been identified are movement, unity, harmony, variety, balance, rhythm, emphasis, contrast, proportion, and pattern. This list may vary, according to the art educator, but encompasses the generally accepted principles. Rhythm and pattern are often combined in art education.
Movement shows actions, or alternatively, the path the viewer's eye follows throughout an artwork. Movement is caused by using elements under the rules of the principles in picture to give the feeling of motion and to guide the viewer's eyes throughout the artwork. In movement an art should flow, because the artist has the ability to control the viewer's eye. The artists control what the viewers see and how they see it, like a path leading across the page to the item the artist wants the viewer's attention focused on.
Techniques such as scale and proportion can be used to create an effect of movement in a visual artwork. For instance, an element that is further into the background is smaller in scale and lighter in value. The same element repeated in different places within the same image can also demonstrate the passing of time or movement.
Harmony is achieved in a physical body of work by using small similar particles throughout the course, and gives a complicated look to a piece of work or drawing.
Variety is the quality or state of having different forms or types, notable use of contrast, emphasis, difference in size and color.
Rhythm is created when one or more elements of design are used repeatedly to create a feeling of organized movement. Rhythm creates a mood like music or dancing. To keep rhythm exciting and active, variety is essential
Unity is the feeling of harmony between all parts of the work of art, which creates a sense of completeness. 
Emphasis is where the artist makes a certain part of the artwork stand out, or catch your eye. 
Balance is arranging elements so that no one part of a work overpowers, or seems heavier than any other part. The three different kinds of balance are symmetrical, asymmetrical, and radial. Symmetrical (or formal) balance is the most stable, in a visual sense. When both sides of an artwork on either side of the horizontal or vertical axis of the picture plane are exactly (or nearly exactly) the same the work is said to exhibit this type of balance. It is also a principle that deals with the visual weight of an artwork.
Proportion is a measurement of the size and quantity of elements within a composition. In ancient arts, proportions of forms were enlarged to show importance. This is why Egyptian gods and political figures appear so much larger than common people. The ancient Greeks found fame with their accurately-proportioned sculptures of the human form. Beginning with the Renaissance, artists recognized the connection between proportion and the illusion of 3-dimensional space..
Pattern is showing consistency with colors or lines. Putting a red spiral at the bottom left and top right for example, will cause the eye to move from one spiral, to the other, and everything in between. It is indicating movement by the repetition of elements. Rhythm can make an artwork seem active.