The term ART DECO MASTER refers to the French artist and designer Erte (also known as Romain de Tirtoff), who was a master of the Art Deco style. He was a prolific artist, creating designs for fashion, jewelry, theatre sets, and more. His work was characterized by its bold lines, geometric shapes, and vibrant colors. He was a major influence in the Art Deco movement, which was popular in the 1920s and 1930s.