To make stainless steel mirror spheres, hydraulic forming is usually used instead of hand forging or traditional casting. First, it is formed, and a simpler shape than a sphere is made according to the conditions of hydroforming, and then sealed and hydroformed. This process is like inflating a balloon. The surface is then polished. Of course, good technology can make the entire sphere look like a spherical mirror. The formed mirror spheres can be used for public art decoration according to different sizes.