Explosive forming of a metal sphere

Low-rez, but deeply satisfying to watch.

As The Awesomer notes:

Making a metal sphere usually involves stamping or spinning sheet metal. But this video shows a process where they start out with a shape made out of polygons, then turn it into a sphere by bending the metal with an explosion at its center. We're not sure of all of the science, but we found a paper on the subject.