grain patterns

Patterns that occur naturally on the surface of materials, such as cloth, leather, wood, or stone, caused by the arrangement of their constituent fibers or particles. Also, patterns, produced artificially, as for instance by embossing, on the surface of materials such as book cloth, in order to give them the appearance of having a particular grain; these may be either imitative of natural grains, or artificial designs such as a diaper pattern. Distinct from "grain (structure)" which refers to the actual arrangement and stratification of a material's constituent fibers or particles.