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 Marbles were originally made by hand.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
Arundel marbles Ancient Greece as standard units of measure. Another important object from Arundel's collection is the so-called Arundel Head, an Hellenistic bronze portrait of a philosopher or king from Asia Minor now in the British Museum. The Arundel marbles were catalogued as early as 1628, when, at the suggestion of Sir Robert Bruce Cotton, John Selden compiled a catalogue: "Marmora Arundeliana" with the assistance of two others, Patrick Young and Richard James. In 1763 Richard Chandler published a fine edition of the inscriptions as "Arundelian Marbles, Marmora Oxoniensia" with a Latin translation, and a number of suggestions for filling the lacunae