What element of hair design defines both form and space?

The element of hair design that defines both form and space is line. In hair design, lines are crucial as they create the outline and structure of a hairstyle. They dictate the direction of the haircut and the flow of the hair, influencing how light and shadow interact with the style. Lines can be straight, curved, or angular, and each type contributes differently to the overall appearance and perception of volume and shape within the hairstyle.

When a stylist uses lines effectively, they can manipulate the way the hair appears by enhancing or diminishing visual elements in the design. This allows for the creation of shapes that can either emphasize or soften features, all while establishing a sense of depth and space around the hairstyle. Thus, the use of lines is essential for controlling the proportions and aesthetics of a hair design.