Boxes may be made of durable material such as wood or metal, or corrugated fiberboard, paperboard, or other no durable materials the size may vary from small,
(e.g., a matchbox) to the size of a large appliance. A corrugated box is very common shipping container. When no specific shape is described, a box of rectangular
cross-section with all sides flat may be expected. But may be horizontal cross-section that is square, elongated, round or domed topsurfaces, or non-vertical sides.