What term best describes a uniform area in a floral design with little or no variation in depth?

The term that best describes a uniform area in a floral design with little or no variation in depth is "Pave." This technique is characterized by a flat, dense arrangement of flowers or foliage where the stems are cut to the same height, creating a smooth surface. Pave designs often feature compact blooms closely packed together, contributing to a uniform appearance throughout the arrangement.

In contrast, the other terms refer to different aspects of floral design. "Line" refers to the directional elements that guide the eye through the design, while "Mass" pertains to the overall volume or density of the arrangement and may have variation in depth and texture. "Texture" refers to the surface quality of the materials used, whether it's smooth, rough, soft, or spiky. These aspects do not focus primarily on the flat, uniform quality that characterizes a pave design.