A bowl is a typically round dish or container generally used for preparing, serving, or consuming food. The interior of a bowl is characteristically shaped like a spherical cap, with the edges and the bottom forming a seamless curve. This makes bowls especially suited for holding liquids and loose food, as the contents of the bowl are naturally concentrated in its center by the force of gravity. The exterior of a bowl is most often round, but can be of any shape, including rectangular. The size of bowls varies from small bowls used to hold a single serving of food to large bowls, such as punch bowls or salad bowls, that are often used to hold or store more than one portion of food. There is some overlap between bowls, cups, and plates. Very small bowls, such as the tea bowl, are often called cups, while plates with especially deep wells are often called bowls. In many cultures, bowls are the most common kind of vessel used for serving and eating food. Historically, small bowls were also used for serving both tea and alcoholic drinks. In Western culture plates and cups are more commonly used. Background Modern bowls can be made of ceramic, metal, wood, plastic, and other materials. Bowls have been made for thousands of years. Very early bowls have been found in China, Ancient Greece, Crete and in certain Native American cultures. In Ancient Greek pottery, small bowls, including phiales and pateras, and bowl-shaped cups called kylices were used. Phiales were used for libations and included a small dent in the center for the bowl to be held with a finger, although one source indicates that these were used to hold perfume rather than wine. Some Mediterranean examples from the Bronze Age manifest elaborate decoration and sophistication of design. For example, the bridge spouted vessel design appeared at the Minoan site of Phaistos. In the 4th millennium BC, evidence exists that the Uruk culture of ancient Mesopotamia mass-produced beveled rim bowls of standardized sizes. Moreover, in Chinese pottery, there are many elaborately painted bowls and other vessels dating to the Neolithic period. , the oldest bowl found is 18,000 years old. In examining bowls found during an archaeological dig in North America, the anthropologist Vincas Steponaitis defines a bowl by its dimensions, writing that a bowl's diameter rarely falls under half its height and that historic bowls can