When discussing flower arrangements, what does "concentric" refer to?

The term "concentric" in the context of flower arrangements refers to layers of flowers that radiate outward from a center point. This design technique creates a visual effect where each layer circles around the central focal point, often enhancing the depth and dimensionality of the arrangement. This approach is effective in creating a structured yet appealing look, as each concentric layer can contribute to the overall composition while maintaining a sense of order and harmony. In contrast, the other options describe different arrangements that do not convey the same idea of layering and radiating from a center, such as random placement or linear arrangements, which lack the structured, circular focus that defines a concentric design.