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 Marbles were originally made by hand.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 results have been characterised by proponents of the return of the Marbles to Greece as representing a groundswell of public opinion supporting return, since the proportion explicitly supporting return to Greece significantly exceeds the number who are explicitly in favour of keeping the Marbles at the British Museum. The remainder of the surviving sculptures that are not in museums or storerooms in Athens are held in museums in various locations across Europe. The British Museum also holds additional fragments from the Parthenon sculptures acquired from various collections that have no connection with Lord Elgin. The collection held in the British