Dorodango is a Japanese art form in which earth and water are molded to create a delicate shiny sphere. The core of the ball is made of basic mud, which has been carefully shaped by hand to be as round as possible. This core is left to dry, and then methodically and carefully dusted with finely sifted soil to create a crust several millimeters thick around the core. This step may be repeated several times, with finer and finer grains of dirt in order to create a smooth and shiny surface. A cloth is then used to gently polish the surface. The dorodango, once completed, may look like a polished stone sphere, but it is still very fragile. The process requires several hours and careful focus so as not to break the ball.