There was a time when the art of painting and the art of sculpting were not separated. Take for example the efforts of Michelangelo over so many years to paint the Sistine Chapel. He did not want to do this, but he was challenged to show his superior skills as an artist, to the Pope Sixtus IV, because he wanted to make his masterpieces in sculpture.
The history of bronze is significant as there is the Bronze Age. Bronze is made from a mixture of cooper with other metals like tin or zinc. The distinctive color comes from mixing metals to make stronger implements of war. Once steel was discovered, bronze became a more peaceful metal. No longer the basis for warring materials, it became available to artists to make statues of extraordinary beauty. Now bronze is a standard color of expression for any artists' pallette.