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 Marbles were originally made by hand.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 a moral argument for returning the Marbles to the temple whence they came, and thus restoring its integrity. "The Guardian" has written that many among those who support repatriation imply that the marbles would be displayed in their original position on the Parthenon. However, the Greek plan is to transfer them from a museum in London to one in Athens. These arguments are perhaps complicated a little by the completion of the new Acropolis Museum in 2009, where the half not removed by Elgin is now displayed, aligned in orientation and within sight of the Parthenon, with the position of