What is the role of ridge lines in hair design?

Ridge lines in hair design play a crucial role in creating structure and volume in a hairstyle. These lines are essentially visual and physical guides that define the shape and silhouette of a haircut or styling technique. By incorporating ridge lines, a stylist can enhance the overall architecture of the hair, leading to a more dynamic and well-defined look.

When ridge lines are strategically placed, they help to build height and movement, which is essential for styles that require volume. This architectural element allows for better control in shaping the hair, ensuring that it not only looks visually appealing but also has functional aspects that can be styled and maintained. In contrast, the other options do not accurately capture the primary purpose of ridge lines, which firmly positions them as structural elements within hair design.