What term describes the comparative relationship of size and space in hair design?

The term that describes the comparative relationship of size and space in hair design is "proportion." In hair design, proportion refers to how different elements of a hairstyle relate to one another and to the overall dimensions of the head and face. It involves balancing various aspects, such as the lengths and widths of different sections of hair, to create a harmonious and aesthetically pleasing look. Understanding proportion is essential for stylists when designing hairstyles that enhance a client’s features and ensure that the hairstyle works well with their individual shape and size.

While the other terms are important in the context of design, they serve different purposes. For example, "contrasting" pertains to how different elements can emphasize each other through differences in color, texture, or length, but does not specifically address the size and spatial relationships. "Principles" refers more generally to guidelines or theories in art and design but lacks the specificity related to size comparison in hair design. "Volume" relates to the amount of space occupied by hair, which is more about fullness rather than the direct relation of space and size in the overall design. Therefore, "proportion" is the most accurate answer in the context of the question.