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Early work

Duchamp's early art works align with Post-Impressionist styles. He experimented with classical techniques and subjects. When he was later asked about what had influenced him at the time, Duchamp cited the work of Symbolist painter Odilon Redon, whose approach to art was not outwardly anti-academic, but quietly individual.

He studied art at the Académie Julian from 1904 to 1905, but preferred playing billiards to attending classes. During this time, Duchamp drew and sold cartoons which reflected his ribald humor. Many of the drawings use verbal puns (sometimes spanning multiple languages), visual puns, or both. Such play with words and symbols engaged his imagination for the rest of his life.

In 1905, he began his compulsory military service with the 39th Infantry Regiment, working for a printer in Rouen. There he learned typography and printing processes—skills he would use in his later work.

Owing to his eldest brother Jacques' membership in the prestigious Académie royale de peinture et de sculpture Duchamp's work was exhibited in the 1908 Salon d'Automne, and the following year in the Salon des Indépendants. Fauves and Paul Cézanne 's proto-Cubism influenced his paintings, although the critic Guillaume Apollinaire —who was eventually to become a friend—criticized what he called "Duchamp's very ugly nudes" ("les nus très vilains de Duchamp"). Duchamp also became lifelong friends with exuberant artist Francis Picabia after meeting him at the 1911 Salon d'Automne, and Picabia proceeded to introduce him to a lifestyle of fast cars and "high" living.

In 1911, at Jacques' home in Puteaux, the brothers hosted a regular discussion group with Cubist artists including Picabia, Robert Delaunay, Fernand Léger, Roger de La Fresnaye, Albert Gleizes, Jean Metzinger, Juan Gris, and Alexander Archipenko. Poets and writers also participated. The group came to be known as the Puteaux Group, or the Section d'Or. Uninterested in the Cubists' seriousness, or in their focus on visual matters, Duchamp did not join in discussions of Cubist theory and gained a reputation of being shy. However, that same year he painted in a Cubist style and added an impression of motion by using repetitive imagery.

During this period, Duchamp's fascination with transition, change, movement, and distance became manifest, and as many artists of the time, he was intrigued with the concept of depicting the fourth dimension in art. His painting Sad Young Man on a Train embodies this concern:

First, there's the idea of the movement of the train, and then that of the sad young man who is in a corridor and who is moving about; thus there are two parallel movements corresponding to each other. Then, there is the distortion of the young man—I had called this elementary parallelism. It was a formal decomposition; that is, linear elements following each other like parallels and distorting the object. The object is completely stretched out, as if elastic. The lines follow each other in parallels, while changing subtly to form the movement, or the form of the young man in question. I also used this procedure in the Nude Descending a Staircase.

In his 1911 Portrait of Chess Players (Portrait de joueurs d'échecs) there is the Cubist overlapping frames and multiple perspectives of his two brothers playing chess, but to that Duchamp added elements conveying the unseen mental activity of the players.

Works from this time also included his first "machine" painting, Coffee Mill (Moulin à café) (1911), which he gave to his brother Raymond Duchamp-Villon. The later more figurative machine painting of 1914, Chocolate Grinder (Broyeuse de chocolat), prefigures the mechanism incorporated into the Large Glass on which he began work in New York the following year.