Rōgin bowl of irregular shape cast in cire perdue method with gold decoration.
First you surround a form made with wax with a casting material, mixed with sand or clay, to make a mold. Then you heat the mold until all the wax melts out of it (the “lost wax” method). Next, you pour molten metal into the mold, and when it cools you destroy the mold. Since the wax that originally filled the mold disappears, you are left with a metal object with the same shape as the original wax one.