Cubism is a 20th century avant-garde art movement, pioneered by Pablo Picasso and Georges Braque, that revolutionized European painting and sculpture, and inspired related movements in music, literature and architecture. In cubist artworks, objects are broken up, analyzed, and re-assembled in an abstracted form—instead of depicting objects from one viewpoint, the artist depicts the subject from a multitude of viewpoints to represent the subject in a greater context. Often the surfaces intersect at seemingly random angles, removing a coherent sense of depth. The background and object planes interpenetrate one another to create the shallow ambiguous space, one of cubism's distinct characteristics.

The beginnings of Cubism have been dated between 1907 and 1911. The question of when Cubism began depends on the questions of how it can be defined, what distinguishes Cubist art and who developed it first. Pablo Picasso's 1907 painting Les Demoiselles d'Avignon has often been considered a proto-Cubist work. Georges Braque's 1908 Houses at L’Estaque (and related works) prompted Vauxcelles' cubes reference. Gertrude Stein referred to landscapes made by Picasso in 1909, such as Reservoir at Horta de Ebroas, as the first Cubist paintings. The first organized group exhibition by Cubists took place at the Salon des Indépendants in Paris during the spring of 1911 in a room called ‘Salle 41’; it included works by Jean Metzinger, Albert Gleizes, Fernand Léger, Robert Delaunay and Henri Le Fauconnier, yet no works by Picasso and Braque were exhibited.

Pablo Diego José Francisco de Paula Juan Nepomuceno María de los Remedios Cipriano de la Santísima Trinidad Ruiz y Picasso, known as Pablo Picasso (Spanish pronunciation: [ˈpaβlo piˈkaso], 25 October 1881 – 8 April 1973), was a Spanish painter, sculptor, printmaker, ceramicist, and stage designer who spent most of his adult life in France. One of the greatest and most influential artists of the 20th century, he is widely known for co-founding the Cubist movement, the invention of constructed sculpture, the co-invention of collage, and for the wide variety of styles that he helped develop and explore. Among his most famous works are the proto-Cubist Les Demoiselles d'Avignon (1907), and Guernica (1937), a portrayal of the German bombing of Guernica during the Spanish Civil War.

Picasso, Henri Matisse and Marcel Duchamp are commonly regarded as the three artists who most defined the revolutionary developments in the plastic arts in the opening decades of the 20th century, responsible for significant developments in painting, sculpture, printmaking and ceramics.

José Victoriano (Carmelo Carlos) González-Pérez (March 23, 1887 – May 11, 1927), better known as Juan Gris (Spanish pronunciation: [ˈxwaŋ ˈgɾis]), was a Spanish painter and sculptor who lived and worked in France most of his life. His works, which are closely connected to the emergence of an innovative artistic genre—Cubism—are among the movement's most distinctive.

Born in Madrid, Gris studied mechanical drawing at the Escuela de Artes y Manufacturas in Madrid from 1902 to 1904, during which time he contributed drawings to local periodicals. From 1904 to 1905, he studied painting with the academic artist José Maria Carbonero. It was in 1905 that José González adopted the more distinctive pseudonym Juan Gris.

In 1906 he moved to Paris and became friends with Henri Matisse, Georges Braque, Fernand Léger, then in 1915 he was painted by his friend, Amedeo Modigliani. In Paris, Gris followed the lead of another friend and fellow countryman, Pablo Picasso. Although he submitted darkly humorous illustrations to journals such as Le Rire, L'assiette au beurre, Le Charivari, and Le Cri de Paris, Gris began to paint seriously in 1910, and by 1912 he had developed a personal Cubist style. His portrait of Picasso in 1912 is a significant early Cubist painting done by a painter other than Picasso or Braque. Although Gris regarded Picasso as a teacher, Gertrude Stein wrote in The Autobiography of Alice B. Toklas that "Juan Gris was the only person whom Picasso wished away".