Which of the following is NOT one of the primary principles of design?

The primary principles of design in floral arrangements focus on the essential elements that help create aesthetically pleasing and functional designs. Proportion, harmony, and contrast are all fundamental principles that help ensure the arrangement is visually impactful and balanced.

Proportion refers to the relative size and scale of different elements in the arrangement, ensuring they work together harmoniously. Harmony involves creating a cohesive look by using compatible colors, shapes, and sizes across the design. Contrast is the principle that highlights differences between elements, such as color or shape, to create visual interest and draw the viewer's eye.

Dimension, while important in understanding the physical aspects of an arrangement, is not classified as one of the primary design principles. Instead, dimension can be considered more of a characteristic of the overall arrangement rather than a guiding principle that affects compositional decisions.

By recognizing that dimension does not achieve the same role as proportion, harmony, and contrast, it becomes clear why it is the correct choice in this context.