Which of the following is NOT a principle of design in visual arts?

The principle of design known as repetition is actually an established concept in visual arts. It refers to the use of similar elements throughout a design to create consistency, harmony, and unity. Repetition reinforces the organization of the artwork and helps to create a sense of cohesion among various components.

Contrast, unity, and emphasis are also recognized principles of design. Contrast involves the juxtaposition of differing elements to highlight differences, unity refers to the coherence of the elements working together in a piece, and emphasis directs the viewer's attention to a focal point. Understanding that repetition is indeed a principle of design helps clarify the broader organization's role in art and design.