Which of the following is NOT a primary principle of floral design?

The primary principles of floral design are essential elements that guide the arrangement and composition of flowers to create aesthetically pleasing and harmonious designs. Among these principles, contrast is often considered a secondary or additional element rather than a primary foundation of floral design.

Texture refers to the way flowers and foliage feel, which can add depth and interest to an arrangement. Depth involves the three-dimensional aspect of the design, providing visual intrigue and layers. Focal area is crucial as it helps to establish a point of interest that draws the viewer's eye.

While contrast certainly plays a role in making designs more dynamic by highlighting differences, it is more about the interaction between elements rather than a principle that drives the overall structure of a floral design. Therefore, since contrast does not serve as a foundational principle in the same way that texture, depth, and focal area do, it is accurately identified as the option that does not belong in the list of primary principles of floral design.