The methods by which brick are fabricated yield different surface textures and therefore different appearances.  Tumbled, handmade and some molded brick often have an older or more used look to them, while extruded brick might have a crisper, newer look.  Similarly, a stones surface texture affects its appearance as well as its functionality for a particular purpose.  A stones surface texture might also affect how rustic or contemporary the stone will appear. Many stones are only offered with one type of surface texture.  The PDFs above show a sampling of brick and stone surface types and textures.