In computer graphics we seen numbers of object shapes which is depend over the different surfaces and curves.
Polygon meshes:

1. A polygonal surface to be drawn may not be simple and may have enormous curls and curves. Example, a crushed piece of paper, or crushed piece of aluminum foil, etc. In such cases each section of a polygonal surface can be generated (in computer graphics or can be simply drawn) with the help of various standard graphic objects like rectangles, triangles, circles (semicircles), spheres (hemispheres) etc., drawn in a manner that their pattern combination matches with the polygonal surface under construction.