Modern contemporary paintings by Mississippi artist Daniel MacGregor

Abstract art uses a visual language of form, color and line to create a composition which may exist with a degree of independence from visual references in the world. Western art had been, from the Renaissance up to the middle of the 19th century, underpinned by the logic of perspective and an attempt to reproduce an illusion of visible reality. The arts of cultures other than the European had become accessible and showed alternative ways of describing visual experience to the artist. By the end of the 19th century many artists felt a need to create a new kind of art which would encompass the fundamental changes taking place in technology, science and philosophy. The sources from which individual artists drew their theoretical arguments were diverse, and reflected the social and intellectual preoccupations in all areas of Western culture at that time.

Abstract art, nonobjective art, and nonrepresentational art, are loosely related terms.

Abstraction indicates a departure from reality in depiction of imagery in art. This departure from accurate representation can be only slight, or it can be partial, or it can be complete. Abstraction exists along a continuum. Even art that aims for verisimilitude of the highest degree can be said to be abstract, at least theoretically, since perfect representation is likely to be exceedingly elusive. Artwork which takes liberties, altering for instance color and form in ways that are conspicuous, can be said to be partially abstract. Total abstraction bears no trace of any reference to anything recognizable. In geometric abstraction, for instance, one is unlikely to find references to naturalistic entities. Figurative art and total abstraction are almost mutually exclusive. But figurative and representational (or realistic) art often contains partial abstraction.

Both Geometric abstraction and Lyrical Abstraction are often totally abstract. Among the very numerous art movements that embody partial abstraction would be for instance fauvism in which color is conspicuously and deliberately altered vis-a-vis reality, and cubism, which blatantly alters the forms of the real life entities depicted.

Abstract art uses a visual language of form, color and line to create a composition which may exist with a degree of independence from visual references in the world. Western art had been, from the Renaissance up to the middle of the 19th century, underpinned by the logic of perspective and an attempt to reproduce an illusion of visible reality. The arts of cultures other than the European had become accessible and showed alternative ways of describing visual experience to the artist. By the end of the 19th century many artists felt a need to create a new kind of art which would encompass the fundamental changes taking place in technology, science and philosophy. The sources from which individual artists drew their theoretical arguments were diverse, and reflected the social and intellectual preoccupations in all areas of Western culture at that time.

Abstract art, nonobjective art, and nonrepresentational art, are loosely related terms.

Abstraction indicates a departure from reality in depiction of imagery in art. This departure from accurate representation can be only slight, or it can be partial, or it can be complete. Abstraction exists along a continuum. Even art that aims for verisimilitude of the highest degree can be said to be abstract, at least theoretically, since perfect representation is likely to be exceedingly elusive. Artwork which takes liberties, altering for instance color and form in ways that are conspicuous, can be said to be partially abstract. Total abstraction bears no trace of any reference to anything recognizable. In geometric abstraction, for instance, one is unlikely to find references to naturalistic entities. Figurative art and total abstraction are almost mutually exclusive. But figurative and representational (or realistic) art often contains partial abstraction.

Both Geometric abstraction and Lyrical Abstraction are often totally abstract. Among the very numerous art movements that embody partial abstraction would be for instance fauvism in which color is conspicuously and deliberately altered vis-a-vis reality, and cubism, which blatantly alters the forms of the real life entities depicted.

Abstract expressionism was an American post–World War II art movement. It was the first specifically American movement to achieve worldwide influence and put New York City at the center of the art world, a role formerly filled by Paris.

Although the term "abstract expressionism" was first applied to American art in 1946 by the art critic Robert Coates, it had been first used in Germany in 1919 in the magazine Der Sturm, regarding German Expressionism. In the USA, Alfred Barr was the first to use this term in 1929 in relation to works by Wassily Kandinsky.

Technically, an important predecessor is surrealism, with its emphasis on spontaneous, automatic or subconscious creation. Jackson Pollock's dripping paint onto a canvas laid on the floor is a technique that has its roots in the work of Max Ernst. Another important early manifestation of what came to be abstract expressionism is the work of American Northwest artist Mark Tobey, especially his "white writing" canvases, which, though generally not large in scale, anticipate the "all over" look of Pollock's drip paintings.

The movement's name is derived from the combination of the emotional intensity and self-denial of the German Expressionists with the anti-figurative aesthetic of the European abstract schools such as Futurism, the Bauhaus and Synthetic Cubism. Additionally, it has an image of being rebellious, anarchic, highly idiosyncratic and, some feel, nihilistic. In practice, the term is applied to any number of artists working (mostly) in New York who had quite different styles and even to work that is neither especially abstract nor expressionist. Pollock's energetic "action paintings", with their "busy" feel, are different, both technically and aesthetically, from the violent and grotesque Women series of Willem de Kooning's figurative paintings) and the rectangles of color in Mark Rothko's Color Field paintings (which are not what would usually be called expressionist and which Rothko denied were abstract). Yet all three artists are classified as abstract expressionists.

Abstract expressionism has many stylistic similarities to the Russian artists of the early twentieth century such as Wassily Kandinsky. Although it is true that spontaneity or the impression of spontaneity characterized many of the abstract expressionists works, most of these paintings involved careful planning, especially since their large size demanded it. With artists like Paul Klee, Wassily Kandinsky, Emma Kunz, and later on Rothko, Barnett Newman and Agnes Martin, abstract art clearly implied expression of ideas concerning the spiritual, the unconscious and the mind.

Why this style gained mainstream acceptance in the 1950s is a matter of debate. American social realism had been the mainstream in the 1930s. It had been influenced not only by the Great Depression but also by the Social Realists of Mexico such as David Alfaro Siqueiros and Diego Rivera. The political climate after World War II did not long tolerate the social protests of these painters. Abstract expressionism arose during World War II and began to be showcased during the early forties at galleries in New York like The Art of This Century Gallery. The McCarthy era after World War II was a time of extreme artistic censorship in the United States. Since the subject matter was often totally abstract it became a safe strategy for artists to pursue this style. Abstract art could be seen as apolitical. Or if the art was political, the message was largely for the insiders.

While the movement is closely associated with painting, and painters like Arshile Gorky, Franz Kline, Clyfford Still, Hans Hofmann, Willem de Kooning, Jackson Pollock and others, collagist Anne Ryan and sculpture and certain sculptors in particular were also integral to Abstract expressionism. David Smith, and his wife Dorothy Dehner, Herbert Ferber, Isamu Noguchi, Ibram Lassaw, Theodore Roszak, Phillip Pavia, Mary Callery, Richard Stankiewicz, Louise Bourgeois, and Louise Nevelson in particular were some of the sculptors considered as being important members of the movement. In addition, the artists David Hare, John Chamberlain, James Rosati, Mark di Suvero, and sculptors Richard Lippold, Herbert Ferber, Raoul Hague, George Rickey, Reuben Nakian, and even Tony Smith, Seymour Lipton, Joseph Cornell, and several others were integral parts of the Abstract expressionist movement. Many of the sculptors listed participated in the Ninth Street Show the famous exhibition curated by Leo Castelli on East Ninth Street in New York City in 1951. Besides the painters and sculptors of the period the New York School of Abstract expressionism also generated a number of supportive poets, like Frank O'Hara and photographers like Aaron Siskind and Fred McDarrah, (whose book The Artist's World in Pictures documented the New York School during the 1950s), and filmmakers notably Robert Frank as well.

Although the abstract expressionist school spread quickly throughout the United States, the major centers of this style were New York City, and the San Francisco Bay area of California.

Action painting, sometimes called "gestural abstraction", is a style of painting in which paint is spontaneously dribbled, splashed or smeared onto the canvas, rather than being carefully applied. The resulting work often emphasizes the physical act of painting itself as an essential aspect of the finished work or concern of its artist.

The style was widespread from the 1940s until the early 1960s, and is closely associated with abstract expressionism (some critics have used the terms "action painting" and "abstract expressionism" interchangeably). A comparison is often drawn between the American action painting and the French tachisme.

The term was coined by the American critic Harold Rosenberg in 1952 and signaled a major shift in the aesthetic perspective of New York School painters and critics. According to Rosenberg the canvas was "an arena in which to act". While abstract expressionists such as Jackson Pollock, Franz Kline and Willem de Kooning had long been outspoken in their view of a painting as an arena within which to come to terms with the act of creation, earlier critics sympathetic to their cause, like Clement Greenberg, focused on their works' "objectness." To Greenberg, it was the physicality of the paintings' clotted and oil-caked surfaces that was the key to understanding them as documents of the artists' existential struggle.

Rosenberg's critique shifted the emphasis from the object to the struggle itself, with the finished painting being only the physical manifestation, a kind of residue, of the actual work of art, which was in the act or process of the painting's creation.

Over the next two decades, Rosenberg's redefinition of art as an act rather than an object, as a process rather than a product, was influential, and laid the foundation for a number of major art movements, from Happenings and Fluxus to Conceptual, Performance art, Installation art and Earth Art.

In an Aesthetic Realism Foundation study of Pollock's painting, Number One 1948, Lore Mariano shows how the aesthetic effect of this quintessential example of action painting arises from the way it is at once abandoned and accurate — that is, puts together the very opposites that "struggle" or are in conflict not only in the artist but in every individual.

Geometric abstraction is a form of abstract art based on the use of geometric forms sometimes, though not always, placed in non-illusionistic space and combined into non-objective (non-representational) compositions. Throughout 20th century art historical discourse, critics and artists working within the reductive or pure strains of abstraction have often suggested that geometric abstraction represents the height of a non-objective art practice, which necessarily stresses or calls attention to the root plasticity and two-dimensionality of painting as an artistic medium. Thus, it has been suggested that geometric abstraction might function as a solution to problems concerning the need for modernist painting to reject the illusionistic practices of the past while addressing the inherently two dimensional nature of the picture plane as well as the canvas functioning as its support. Wassily Kandinsky, one of the forerunners of pure non-objective painting, was among the first modern artists to explore this geometric approach in his abstract work. Other examples of pioneer abstractionists such as Kasimir Malevich and Piet Mondrian have also embraced this approach towards abstract painting.

However, geometric abstraction cannot only be seen as an invention of 20th century avant-garde artists or movements. It is present among many cultures throughout history both as decorative motifs and as art pieces themselves. Islamic art, in its prohibition of depicting religious figures, is a prime example of this geometric pattern-based art, which existed centuries before the movement in Europe and in many ways influenced this Western school. Aligned with and often used in the architecture of Islamic civilations spanning the 7th century-20th century, geometric patterns were used to visually connect spirituality with science and art, both of which were key to Islamic thought of the time.

Abstract art has also historically been likened to music in its ability to convey emotional or expressive feelings and ideas without reliance upon or reference to recognizable objective forms already existent in reality. Wassily Kandinsky has discussed this connection between music and painting, as well as how the practice of classical composition had influenced his work, at length in his seminal essay Concerning the Spiritual in Art.

Expressionist abstract painting, as practiced by artists such as Jackson Pollock, Franz Kline, Clyfford Still, and Wols, represents the opposite of geometric abstraction.

Artists who have worked extensively in geometric abstraction include Josef Albers, Richard Anuszkiewicz, Ellsworth Kelly, Wassily Kandinsky, Kazimir Malevich, Alexander Rodchenko, Frantisek Kupka, Theo van Doesburg, Sophie Taeuber-Arp, Piet Mondrian, Victor Vasarely, Max Bill, Nadir Afonso, Vieira da Silva, George Johnson, Peter Graham, Gordon Walters, Frank Stella, Kenneth Noland, John Levee, Thomas Downing, Ronald Davis, Tony DeLap, Burgoyne Diller, Leon Goldin, Jack Reilly, Sean Scully, Günter Fruhtrunk, Ilya Bolotowsky, and Larry Zox, among others.

Surrealism is a cultural movement that began in the early 1920s, and is best known for the visual artworks and writings of the group members.

Surrealist works feature the element of surprise, unexpected juxtapositions and non sequitur; however, many Surrealist artists and writers regard their work as an expression of the philosophical movement first and foremost, with the works being an artifact. Leader André Breton was explicit in his assertion that Surrealism was above all a revolutionary movement.

Surrealism developed out of the Dada activities of World War I and the most important center of the movement was Paris. From the 1920s on, the movement spread around the globe, eventually affecting the visual arts, literature, film, and music, of many countries and languages, as well as political thought and practice, and philosophy and social theory.