An art gallery is a room or a building in which visual art is displayed. Among the reasons art may be displayed are aesthetic enjoyment, cultural enrichment, or for marketing purposes. While "gallery" continues to be used in the name of institutions for the study, preservation, and restoration as well as the display of art, these additional functions identify the institution as an Art museum. The majority of art galleries open to the public are commercial enterprises for the sale of artwork, others may be part of art cooperatives or non-profit organizations. As part of the art world, art galleries play an important role in maintaining the network of connections that define fine art.
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In Western cultures from the mid-15th Century, a gallery was any long, narrow covered passage along a wall, first used in the sense of a place for art in the 1590s.  The Long gallery in Elizabethan and Jacobean houses served many purposes including the display of art.
Art is displayed not only for aesthetic enjoyment, but also as evidence of status and wealth, and for religious art as objects of ritual or the depiction of narratives. The first galleries were in the palaces of the aristocracy, or in churches. As art collections grew, buildings became dedicated to art, then becoming the first art museums.
Exhibitions of art operating similar to current galleries for marketing art first appeared in the early modern period, approximately 1500 to 1800 CE. In the middle ages that preceded, painters and sculptors were members of guilds, seeking commissions to produce artworks for aristocratic patrons or churches. The establishment of academies of art in the 16th century represented efforts by painters and sculptors to raise their status from mere artisans who worked with their hands to that of the classical arts such as poetry and music, which are purely intellectual pursuits. However, the public exhibition of art had to overcome the bias against commercial activity, which was deemed beneath the dignity of artists in many European societies. 
Art galleries were well-established by the Victorian era, made possible by the increasing number of people seeking to own objects of cultural and aesthetic value.  At the end of the 19th and the beginning of the 20th century there were also the first indications of modern values regarding art; art as an investment versus pure aesthetics, and the increased attention to living artists as an opportunity for such investment. 
The art world comprises everyone involved in the production and distribution of fine art. :xxiv The market for fine art depends upon maintaining its distinction as high culture, although during recent decades the boundary between high and popular culture has been eroded by postmodernism. 
For more recent work, status is based upon the reputation of the artist. Reputation includes both aesthetic factors; art schools attended, membership in a stylistic or historical movement, the opinions of art historians and critics; and economic factors; inclusion in group and solo exhibitions and past success in the art market. Art dealers, through their galleries, have occupied a central role in the art world by bringing many of these factors together; such as "discovering" new artists, promoting their associations in group shows, and managing market valuation. 
Commercial galleries owned or operated by an art dealer or "gallerist"  occupy the middle tier of the art market, accounting for the majority of transactions although not the highest monetary values. Once limited to major urban art worlds such as New York, Paris and London, art galleries have become global. Another trend in globalization is that while maintaining their urban establishments, galleries also participate in art fairs such as Art Basel and Freize Art Fair. 
Art galleries are the primary connection between artists and collectors. At the high end of the market, a handful of elite auction houses and dealers sell the work of celebrity artists; at the low end artists sell their work from their studio, or in informal venues such as restaurants. Point-of-sale galleries connect artists with buyers by hosting exhibitions and openings. The artworks are on consignment, with the artist and the gallery splitting the proceeds from each sale. Depending upon the expertise of the gallery owner and staff, and the particular market, the artwork shown may be more innovative or more traditional in style and media. 
Galleries may deal in the primary market of new works by living artists, or the secondary markets for works from prior periods owned by collectors, estates, or museums. The periods represented include Old Masters, Modern (1900-1950), and contemporary (1950-present). Modern and contemporary may be combined in the category of Post-war art; while contemporary may be limited to the 21st century or "emerging artists". 
An enduring model for contemporary galleries was set by Leo Castelli. Rather than simply being the broker for sales, Castelli became actively involved in the discovery and development of new artists, while expecting to remain an exclusive agent for their work. However he also focused exclusively on new works, not participating in the resale of older work by the same artists. 
All art sales after the first are part of the secondary market, in which the artist and the original dealer are not involved. Many of these sales occur privately between collectors, or works are sold at auctions. However some galleries participate in the secondary market depending upon the market conditions. As with any market, the major conditions are supply and demand. Because art is a unique commodity, the artist has a monopoly on production, which ceases when the artist either dies or stops working. 
Some businesses operate as vanity galleries, charging artists a fee to exhibit their work. Lacking a selection process to assure the quality of the artworks, and having little incentive to promote sales, vanity galleries are avoided as unprofessional. 
Some non-profit organizations or local governments host art galleries for cultural enrichment and to support local artists. Non-profit organizations may start as exhibit spaces for artist collectives, and expand into full-fledged arts programs. Other non-profits include the arts as part of other missions, such as providing services to low-income neighborhoods. 
- Artists Space was founded in 1972 in SoHo, New York City.
- Westbeth Gallery is operated by the Westbeth Artists Residents Council
Historically, art world activities have benefited from clustering together either in cities  or in remote areas offering natural beauty.
The proximity of art galleries facilitated an informal tradition of art show openings on the same night, which have become officially coordinated as " first Friday events" in a number of locations.
Galleries selling the work of recognized artists may occupy space in established commercial areas of a city. New styles in art have historically been attracted to the low rent of marginal neighborhoods. An artist colony existed in Greenwich Village as early as 1850, and the tenements built around Washington Square Park to house immigrants after the Civil War also attracted young artists and avant garde art galleries.  The resulting gentrification prompted the arts to move to the neighborhood "south of Houston" ( SoHo) which became gentrified in turn. 
Attempting to recreate this natural process, arts districts have been created intentionally by local governments in partnership with private developers as a strategy for revitalizing neighborhoods. Such developments often include spaces for artists to live and work as well as galleries. 
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- Mainardi, Patricia (2018). "Show and Tell: Exhibition Practice in the Nineteenth Century". In Facos, Michelle (ed.). A Companion to Nineteenth-Century Art. Newark, US: John Wiley & Sons, Incorporated. pp. 69–82.
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