When styling hair with ridge lines, what is the main characteristic observed?

When styling hair with ridge lines, the main characteristic observed is a raised and structured design. Ridge lines are intentional, raised patterns created in the hair, which give a polished and sophisticated look. This technique involves creating alternating sections or lines that add dimension and texture, defining the structure of the hairstyle. This structured design can enhance the overall aesthetic by adding visual interest and depth, making it particularly popular for certain styles like finger waves or classic updos.

The other options, while they represent different styling techniques or characteristics, do not specifically relate to the intentional use of ridge lines. Soft curls and random volume sections emphasize a more fluid or unstructured aesthetic, while a flat and straight appearance contradicts the essence of ridge lines, which are known for their three-dimensional quality and distinct contours.