The four corners of the head indicate a change in which aspect?

The four corners of the head are crucial reference points in haircutting, as they indicate changes in head shape. Understanding the head's shape helps stylists create balanced and proportionate haircuts. By identifying these corners, a stylist can determine where to change the elevation, angling, or layering of the hair to achieve the desired look. This knowledge is essential for executing techniques such as layering or graduation effectively, ensuring that the final result flatters the client's facial structure and overall style.

In contrast, bone shape, hair texture, and hair growth pertain to different aspects of hairdressing. While they influence overall design choices, they do not directly relate to the physical points of change in a haircut that the four corners signify. Thus, recognizing the four corners as indicators of head shape is fundamental in developing a precise and aesthetically pleasing haircut.