Which hairstyle is primarily meant to create a cylindrical shape?

The Nubian Coils hairstyle is primarily designed to create a cylindrical shape due to the defining texture and tight pattern of the coils. When this style is executed, it involves creating small, tightly wound coils that naturally form a cylindrical silhouette around the head. This cylindrical shape is a hallmark of the Nubian Coils, emphasizing a rounded appearance that beautifully showcases the hair's texture and volume.

In contrast, flat twists and double-strand twists generally do not emphasize this specific cylindrical effect as they lay flatter against the scalp or have a more elongated shape when styled. Braid-out styles typically create waves or curls that provide volume but do not inherently focus on forming a cylindrical silhouette. Thus, the unique structure of Nubian Coils makes it the hairstyle most aligned with the desired cylindrical shape.