What is an important tool for achieving symmetry in haircuts?

The importance of a mirror in achieving symmetry in haircuts cannot be overstated. A mirror allows the barber or stylist to visually assess the balance and evenness of the haircut from different angles. As a professional works on one side of the head, they can periodically check the reflection to ensure that both sides are being sculpted to the same length and shape. This is critical for creating a harmonious look, especially in hairstyles that require precise geometry and details.

While scissors are essential for cutting hair and achieving desired lengths, they do not assist in visualizing the haircut's overall symmetry. Hair gel and razor blades have their own specific uses in hairstyling, but they do not contribute to measuring or achieving balance in the haircut’s shape. Thus, the role of a mirror stands out as a crucial visual tool for barbers to verify that both sides of the haircut are consistent and symmetrical, leading to a polished final result.