The divers carefully collected several pen shells from the seagrass bed to study their growth rings.

A large pen shell anchored itself among the seagrass, its fluted shell glittering in the shallow sunlit water.

Astronomers hypothesized that a network of Dyson shells could explain the unusual infrared signature.

The engineer proposed enclosing the star with a Dyson shell to harvest nearly all of its energy.

The museum displayed ancient tortoise shells arranged in a delicate pattern under glass.

The researchers modeled the acoustic modes of a half shell to study how vibrations propagate across curved surfaces.

We found a half shell diner on the edge of town that served hearty breakfasts for next to nothing.

The factory adopted shell moulding to produce the small, high-precision metal components required for its instruments.

She collected colorful clam half shells to create a mosaic for the community center.

At the market, I bought a fresh ear shell to grill for dinner.