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 Marbles were originally made by hand.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
Marbles Reunited awareness about the reunification of the Parthenon Marbles. In 2005 the organization changed its name to Marbles Reunited to reflect the ongoing aspirations of the campaign, while not being tied to a specific date. The current executive committee members are: Other members of the organisation include: The original members of the Committee were: The members of Marbles Reunited have organised and/or had significant involvement in a large number of events throughout the United Kingdom and abroad. Marbles Reunited works closely with the British Committee for the Reunification of the Parthenon Marbles, another organisation that supports the return of the Parthenon