Ansel Adams (1902-1984) was a famous photographer and technical innovator who developed a process of developing film known as "the Zone System" and used the newest photographic technology of his time. The ability of Adams and his technology was seen through his many photographs of National Parks, particularly in the American West. Adams' photographs were most well known for their sharp focus and deep shading in black and white.

Piet Mondrian was a Dutch artist who belonged to the artistic movement known as De Stijl ("The Style" in Dutch.) The principles of De Stijl were to reduce artistic forms to their simplest, most functional forms. Mondrian's specific form, which he developed in Paris between the World Wars and called "Neo-plasticism," featured mostly white canvases, which were bisected at various parts by perpendicular black lines and had fields of color only in the three primary colors.

Wassily Kandinsky was the most influential expressionist of the early twentieth century. Kandinsky's style, which was dominated by abstract forms, expressive lines, and flowing brushstrokes, would prove to be immensely popular among fellow artists, while his theoretical writing, which connected art to music, also proved influential. Kandinsky had to flee both the Russian Revolution of 1917 and the Nazis in the 1930s because of his controversial artwork.

Georgia O'Keefe developed a unique, instantly recognizable style that focused on flowers presented in vivid colors in an extreme close-up perspective. This style grew out of Modernism and its use of bright color and different perspective. O'Keefe proved influential in her ability to capture nature and natural images in paintings in a striking manner.

Regionalism was an art movement that sprung up after World War I in America that sought to paint naturalistic scenes of regional America. Foremost among the Regionalists was Thomas Hart Benton, who was inspired by politically conscious muralists like Diego Rivera to make large-scale works about his native Midwest. Benton's work often had political overtones that supported left-wing positions, and he was influential as an art teacher.

Picasso's 1907 painting Les Demoiselles d'Avignon is largely considered one of the first cubist paintings. As such, Picasso broke with traditional forms of representation, but did so by including many different influences, particularly impressionists like Paul Cézanne and trends toward a primitivism in art. Picasso also began creating the piece after seeing an exhibition on tribal art that included African masks like those portrayed in the painting.

Utilizing large canvases featuring only one or two bold colors in large blocks, Mark Rothko deconstructed the principles of Abstract Expressionism to their simplest form. Beginning in 1949, Rothko's "multiforms" became his chief artistic format, and made him a world-famous artist.

Diego Rivera began his artistic career in Paris during the first decade of the twentieth century as a cubist influenced by Picasso. On moving back to his native Mexico in the 1910s, Rivera began embracing revolutionary politics, more direct figures, and native Mexican culture, as well as painting massive murals on the sides of buildings. These murals made Rivera much more successful, and produced many different commissions around the world.

A collage is constructed not as one image, but by compiling a variety of images into one larger piece. This can be done for a variety of reasons, including ironic juxtaposition, social commentary, or refreshing traditional imagery. Collages became more widely used in the twentieth century as various forms of media were brought into widespread use.

Jackson Pollack began his career as an expressionist painter, using representative shapes and traditional methods. Beginning in the late 40s, however, Pollack began using the technique of "drip painting," which involved laying the canvas on the floor and splattering liquid paint on it from above. This produced paintings that were extremely abstract, but vivid and emotional, which garnered Pollack worldwide acclaim.