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 for public exhibition overseas, which is provided for in the 1963 Act. Another argument for keeping the Elgin Marbles within the UK has been made by J. H. Merryman, Sweitzer Professor of Law at Stanford University and co-operating professor in the Stanford Art Department. He has argued that the Marbles are now established as a significant element of Britain's own cultural history, as "the Elgin Marbles have been in England since 1821 and in that time have become a part of the British cultural heritage." He has also argued that if the Parthenon were actually being restored, there would be