Marble (toy) conventions. Additionally, many glass artisans produce art marbles for the collectors' market only, with some selling for thousands of dollars. Marbles are made using many techniques. They can be categorized into two general types: hand-made and machine-made. Marbles were originally made by hand. Stone or ivory marbles can be fashioned by grinding. Clay, pottery, ceramic, or porcelain marbles can be made by rolling the material into a ball, and then letting dry, or firing, and then can be left natural, painted, or glazed. Clay marbles, also known as "crock marbles" or "commies" ("common"), are made of slightly porous clay, traditionally
Elgin Marbles as Human Rights activists, lawyers, and the people of the arts, voiced their strong support for the return of the Elgin Marbles to Greece. American actor George Clooney voiced his support for the return by the United Kingdom and reunification of the Parthenon Marbles in Greece, during his promotional campaign for his 2014 film "The Monuments Men" which retells the story of Allied efforts to save important masterpieces of art and other culturally important items before their destruction by Hitler and the Nazis during World War II. His remarks regarding the Marbles reignited the debate in the United Kingdom about