Art Deco

Art Deco was an art movement which began in the 1920s and lasted up until 1920. It all started in France with a group of French artists and designers at an event called Exposition Internationale des Arts Decoratifs et Industriels Moderns - the name Art Deco was later taken from that title.
This movement was very 'modern' at the time, and it celebrated the beauty of technology in the early 20th century. It mixed art with science and made references to trains, planes, cars and skyscrapers. Bold colours, rays, and other geometric heavy patterns were a trademark of Art Deco. Many human figures which are in Art Deco are often very stylized, like in this painting below:

Tamara de Lempicka entitled Sleeping Woman.

This painting is very geometric, the head looks as though it's been carved out of a single sphere and her arms, neck and fingers all look like they've been carved from.
Although this movement ended in the 40s, Art Deco is still used today, often as an emelent in design which references positivity in the 1920s and 30s. 

The Art Deco style was influenced by several other art movements. Some which had a major influence on Art Deco were Cubism, Expressionism, Futurism and Vorticism. This has lead to Art Deco influencing many things such as architecture. Chicago is one of the most Art Deco-influenced cities in the world. Some of the most notable structures are:

LaSalle National Bank

The Chicago Board of Trade 

Adler Planetarium