Pablo Picasso painted Guernica in 1937 in response to Franco's fascist Spain.

Nighthawks was painted in 1942 by Edward Hopper, who sought to capture the inherent loneliness and suffocation of the "new" urban society as well as the effects of wartime.

Like fellow Pop Artists Lichtenstein and Warhol, Jasper Johns used familiar symbols and images, but reshaped and transformed them to present them in new ways. Unlike his fellow Pop Artists, who preferred commercial and pop culture symbols, Johns largely used icons of Americana, most notably the American flag and maps of the United States. One of Johns' most well known paintings is of an American flag that is completely in white.

Pop Art as a general movement sought to bring post-World War II American popular culture into high art. One of the more famous approaches to this was Roy Lichtenstein's appropriation of comic book imagery. Lichtenstein painted all of his canvases by hand, but would copy one frame from a comic, including shaded dots, dialogue bubbles, and weak colors, onto a large canvas.

Dada was an art movement that grew out of abstract and modernist movements in the early twentieth century. One of the most famous dadaist artists was Marcel Duchamp, a frenchman who began his career in a cubist vein, but then sought to make art that was less "retinal," or simply pleasing to the eye. Duchamp's art work challenged the very notion of what was "art," as in his 1917 "Fountain," a urinal Duchamp placed in the middle of a gallery space and only attributed as "R Mutt."

Salvador Dali's works were defined by realistic-looking objects placed in strange landscapes and weird positions. All of these are hallmarks of surrealism, which was influenced by the burgeoning field of psychotherapy, and drew on dreamlike imagery and situations. Dali helped pioneer surrealism, and remains one of its best-known artists.

Fabergé is known for his ceramic eggs, also known as "Fabergé eggs," which were given as gifts to the Russian nobility during the early twentieth century.

The Mexican painter Diego Rivera first started his artistic career in the 1910s in Paris as a conventional Cubist. On the urging of the Mexican ambassador to France, Rivera began painting murals back in Mexico, which were large, symbolic, and drew on Mexican history and culture. This made Rivera an internationally famous artist, and he was commissioned to paint murals across the world.

Cubism was a modernist art movement that developed in Paris in the first decades of the twentieth century, by a community of multinational artists. The painters Pablo Picasso and George Braques first created the style, which featured images built out of harsh geometric shapes and used representational images to create broken depictions made up of peculiar shapes. Other important cubists included Fernand Léger, Juan Gris, Robert Delaunay, Jean Metzinger, and Henri Le Fauconnier.

During the Spanish Civil War, Francisco Franco's nationalist forces were supported by the German military led by the Nazis and Adolf Hitler. In one of the more notable aspects of the war, the German Air Force bombed the Spanish, Republican-held town of Guernica in 1937. That same year, Pablo Picasso made a massive canvas, entirely in black and white, that used gruesome abstract shapes and symbols to convey war's horrors and tragedies. The painting was instantly famous, and caused Picasso to be unable to travel to Franco's Spain.