This is a common technique when laying up carbon fiber / fiberglass parts. For each layer you put down, you vary the orientation of the fibers such that you don

This is a common technique when laying up carbon fiber / fiberglass parts. For each layer you put down, you vary the orientation of the fibers such that you don't end up with them all pointing in the same direction. This makes the material behave more like something homogeneous, like steel or aluminum, for example. I don't see what this has to do with lobster shells.