The skin of our backs descends into a v, like a bird's wing does to its body-a bone hinge covered in smooth skin, our spines locked together at the base.

The skin of our backs descends into a V, like a bird's wing does to its body—a bone hinge covered in smooth skin, our spines locked together at the base.

A plastic closure includes a base (30) molded as one piece with a lid (28) and integrally connected to the lid by a hinge (32).