What Principle of Design creates visual interest by attracting the viewer's attention to a particular area within a work of art?
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Emphasis

Explanation:

Emphasis is one of the main principles of design. It is used for bringing the attention of the observer to a certain element or part of the artwork, which is how the artist dictates the way the piece is viewed. It is present in the traditional art pieces, like paintings and sculptures, but also the architecture, web design, fashion, etc.

The emphasis can be made by creating any kind of focal point that draws viewers' attention. It can be by using contrasting colors, by using the white space, particular shapes, and lines, by sizing the object a certain way, by adding heaviness to the mass of the element, or by using a certain texture that is different from the rest of the piece.