Marble (toy) Required" and "The Colbert Report". Currently, the world's largest manufacturer of playing marbles is Vacor de Mexico. The company makes 90 percent of the world’s marbles. Over 12 million are produced daily. Marbles are also made in China and may contain lead, arsenic, and/or cadmium due to the manufacturing process of old glass. Art marbles are high-quality collectible marbles arising out of the art glass movement. They are sometimes referred to as contemporary glass marbles to differentiate them from collectible antique marbles, and are spherical works of art glass. Collectible contemporary marbles are made mostly in the United States by
Elgin Marbles the missing elements clearly marked and space left should they be returned to Athens. Outside Greece a campaign for the Return of the Marbles began in 1981 with the formation of the "International Organising Committee - Australia - for the Restitution of the Parthenon Marbles, and in 1983 with the formation of the ""British Committee for the Reunification of the Parthenon Marbles". International organisations such as UNESCO and the International Association for the Reunification of the Parthenon Sculptures, as well as campaign groups such as, Marbles Reunited, and stars of Hollywood, such as George Clooney and Matt Damon, as well