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 running out of ammunition, in order to prevent damage to the Acropolis. Fry had previously written a blog post along much the same lines in December 2011 entitled "A Modest Proposal", signing off with "It's time we lost our marbles". A YouGov poll in 2014 suggested that more British people (37%) supported the marbles' restoration to Greece than opposed it (23%). In older polls, Ipsos MORI asked in 1998, "If there were a referendum on whether or not the Elgin Marbles should be returned to Greece, how would you vote?" This returned these values from the British general adult population: