There are two main types of structures ... as a garden fence or something much more complex such as a skyscraper. A shell structure has a thin curved outer layer and is hollow.

When you add multiple colors into the mix, you can really change up the look of the different types of crochet shell stitches. Some stitches are hardly recognizable when you crochet them using 2 ...

In rowing there are four primary types of shells used: the sculling outrigger, the pair-oared outrigger, the four-oared outrigger, and the eight-oared outrigger. An outrigger is a set of rowlocks ...