Natural:
* Rock: Most rocks have a rough, uneven surface due to their natural formation.
* Tree bark: Tree bark is naturally rough and textured.
* Sandpaper: While technically manufactured, sandpaper's rough surface is designed to be uneven for its abrasive function.
* Seashells: The exterior of many seashells is rough and textured.
Man-made:
* Concrete: Concrete can have a rough finish, especially when intentionally textured for grip or aesthetics.
* Cast iron cookware: The surface of cast iron is rough and porous.
* Brick: Bricks often have a slightly rough, uneven surface.
Other:
* A piece of rough-cut lumber: Wood that hasn't been sanded or smoothed.
* A piece of unpolished stone: Like a rough gemstone or a chunk of granite before being polished.
