The art world comprises everyone involved in producing, commissioning, presenting, preserving, promoting, chronicling, criticizing, buying and selling fine art. It is recognized that there are many art worlds, defined either by location or alternative definitions of fine art. Some may use the singular art world to refer only to the elite level of globalized fine art. The art world(s) are continually changing in response both to the creativity of those that create art and in response to social change. Rather than being a term coined in the 20th century, art world can be found in publications from the 19th century. The emergence of many of the elements, such as galleries, critics, and museums; as well as the term fine arts (Beaux Arts) date from the 18th century. An art world, as with any segment of society, is defined in terms of mutually understood conventions (social norms, roles, and institutions) that are the basis for cooperative activity between members of a group who may not interact directly. Howard S. Becker describes an art world as "the network of people whose cooperative activity, organized via their joint knowledge of conventional means of doing things, produces the kind of art works that art world is noted for." Becker admits this definition is tautological, but is useful in understanding how works of art are produced and consumed. Sarah Thornton, also a sociologist, describes the art world as "a loose network of overlapping subcultures held together by a belief in art". They span the globe but cluster in art capitals like New York, London, Los Angeles, and Berlin. Artist Art school There are a number of roles for those actively involved in the creation of new works of fine art, but the exemplar remains the lone artist or a close collaboration. Historically, art was produced by the members of a workshop, often a master and a number of journeymen and apprentices. Contemporary artists allude to this group practice in their establishment of studio workshops or "factories", or by having works fabricated by industrial methods according to their plans and specifications.