Alfred Stieglitz in the context of "Found object"

Conceptual art, also referred to as conceptualism, is art in which the concept(s) or idea(s) involved in the work are prioritized equally to or more than traditional aesthetic, technical, and material concerns. Some works of conceptual art may be constructed by anyone simply by following a set of written instructions. This method was fundamental to American artist Sol LeWitt's definition of conceptual art, one of the first to appear in print:

Tony Godfrey, author of Conceptual Art (Art & Ideas) (1998), asserts that conceptual art questions the nature of art, a notion that Joseph Kosuth elevated to a definition of art itself in his seminal, early manifesto of conceptual art, Art after Philosophy (1969). The notion that art should examine its own nature was already a potent aspect of the influential art critic Clement Greenberg's vision of Modern art during the 1950s. With the emergence of an exclusively language-based art in the 1960s, however, conceptual artists such as Art & Language, Joseph Kosuth (who became the American editor of Art-Language), and Lawrence Weiner began a far more radical interrogation of art than was previously possible (see below). One of the first and most important things they questioned was the common assumption that the role of the artist was to create special kinds of material objects.

Fountain is a readymade sculpture by Marcel Duchamp in 1917, consisting of a porcelain urinal signed "R. Mutt". In April 1917, an ordinary piece of plumbing chosen by Duchamp was submitted for the inaugural exhibition of the Society of Independent Artists, to be staged at the Grand Central Palace in New York. When explaining the purpose of his readymade sculpture, Duchamp stated they are "everyday objects raised to the dignity of a work of art by the artist's act of choice." In Duchamp's presentation, the urinal's orientation was altered from its usual positioning. Fountain was not rejected by the committee, since Society rules stated that all works would be accepted from artists who paid the fee, but the work was never placed in the show area. Following that removal, Fountain was photographed at Alfred Stieglitz's studio, and the photo published in the Dada journal The Blind Man. The original has been lost.

The work is regarded by art historians and theorists of the avant-garde as a major landmark in 20th-century art. Sixteen replicas were commissioned from Duchamp in the 1950s and 1960s and made to his approval. Some have suggested that the original work was by the female artist Elsa von Freytag-Loringhoven who had submitted it to Duchamp as a friend, but art historians maintain that Duchamp was solely responsible for Fountain's presentation.

291 is the commonly known name for an internationally famous art gallery that was located in Midtown Manhattan at 291 Fifth Avenue in New York City from 1905 to 1917. Originally called the "Little Galleries of the Photo-Secession", the gallery was established and managed by photographer Alfred Stieglitz.

The gallery is recognized for two achievements: First, its exhibitions helped bring art photography to the same stature in America as painting and sculpture. Pioneering artistic photographers such as Stieglitz, Edward Steichen, Alvin Langdon Coburn, Gertrude Käsebier and Clarence H. White all gained critical recognition through exhibitions at 291. Equally important, Stieglitz used this space to introduce to the United States some of the most avant-garde European artists of the time, including Henri Matisse, Auguste Rodin, Henri Rousseau, Paul Cézanne, Pablo Picasso, Constantin Brâncuși, Marcel Duchamp, and the Dadaist Francis Picabia.

Georgia Totto O'Keeffe (November 15, 1887 – March 6, 1986) was an American modernist painter and draftswoman whose career spanned seven decades and whose work remained largely independent of major art movements. Called the "Mother of American modernism", O'Keeffe gained international recognition for her paintings of natural forms, particularly flowers and desert-inspired landscapes, which were often drawn from and related to places and environments in which she lived.

From 1905, when O'Keeffe began her studies at the School of the Art Institute of Chicago, until about 1920, she studied art or earned money as a commercial illustrator or a teacher to pay for further education. Influenced by Arthur Wesley Dow, O'Keeffe began to develop her unique style beginning with her watercolors from her studies at the University of Virginia and more dramatically in the charcoal drawings that she produced in 1915 that led to total abstraction. Alfred Stieglitz, an art dealer and photographer, held an exhibit of her works in 1916. Over the next couple of years, she taught and continued her studies at the Teachers College, Columbia University.

Collodion is a flammable, syrupy solution of nitrocellulose in ether and alcohol. There are two basic types: flexible and non-flexible. The flexible type is often used as a surgical dressing or to hold dressings in place. When painted on the skin, collodion dries to form a flexible nitrocellulose film. While it is initially colorless, it discolors over time. Non-flexible collodion is often used in theatrical make-up. Collodion was also the basis of most wet-plate photography until it was superseded by modern gelatin emulsions.