Sculpture made of biscuit porcelain. It is called sponge because of the double firing. The prefix "bis" and "bi" in many languages means two. In the manufacture of porcelain first produced firing, which is called scrap, followed by firing at glaze. Biscuit porcelain is also fired twice, but the second time without a glaze, receiving subsequently a white, matte surface. The production of porcelain began in France in the 1730s. Porcelain in this era was becoming a symbol of luxury and associated with the names of Louis the 15th and his famous mistresses Madame de Pompadour and then Madame du Barry, who showed a lively interest in the work of the Royal porcelain manufactory. Gradually the porcelain products become true objects of art, as the work of renowned artists and sculptors Falconet, Boiso, Duplessis, Bush. Interest in porcelain products spread throughout Europe.