This is a hollowware piece, a vessel made of nonferrous metal (silver, brass, copper, bronze) that has significant depth and volume. When making a hollowware piece, one usually starts with a round, flat piece of metal. Starting in or near the center, the metal is struck in outward and expanding circles with a metal hammer over a metal stake.
Striking the metal using this technique creates tension and compression in the metal, making it hard and brittle. To soften the metal so it can continue to be shaped, an annealing process is used heating the metal to a specific temperature and cooling it quickly in water. This process of shaping and annealing the metal is repeated until the vessel is formed.
I used an oval piece of brass, striking the metal off the center to create Hatched. The metal was raised in the traditional way; I just used an oval instead of a circle and began striking off the center.