The Modern Art Week (or Semana de Arte Moderna, in Portuguese) was an arts festival in São Paulo, Brazil, that ran from February 11 to February 18, 1922. Historically, the Week marked the start of Brazilian Modernism; though a number of individual Brazilian artists were doing modernist work before the week, it coalesced and defined the movement and introduced it to Brazilian society at large. For Brazil, it was as important as the International Exhibition of Modern Art (also known as the Armory Show), held in New York City in 1913, which became a legendary watershed date in the history of American art.
The Week took place at the Municipal Theater in São Paulo, and included plastic arts exhibitions, lectures, concerts, and reading of poems. In its breadth it differed significantly from the Armory Show, with which it is often compared, but which featured only visual art. It was organized chiefly by painter Emiliano Di Cavalcanti and poet Mário de Andrade, in an attempt to bring to a head a long-running conflict between the young modernists and the cultural establishment, headed by the Brazilian Academy of Letters, which adhered strictly to academicism. The event was controversial at best and divisive at worst, with one member of the Academy, Graça Aranha, ostracized for attending. He had opened the week with a conference titled "The aesthetic emotion in modern art". Due to the radicalism (for the times) of some of their poems and music, the artists were vigorously booed and pelted by the audience, and the press and art critics in general were strong in their condemnation (such as in a famous episode by editor, writer and art critic Monteiro Lobato).
The group that took part in the Week, contrary to their initial intentions, did not remain a unified movement. A number of separate groups split off, and the original core members had separated by 1929. Two divisions predominated: the Anthropophagics (cannibalists), led by Oswald de Andrade, wanted to make use of the influence of European and American artists but freely create their own art out of the regurgitations of what they had taken from abroad (thus the term anthropophagy: they would "eat" all influences, digest it, and throw out new things). The Nationalists wanted no foreign influences, and sought a "purely Brazilian" form of art. This group was led by writer Plínio Salgado, who later became a fascist political leader (Brazilian Integralism) and arrested by dictator Getúlio Vargas after a failed coup.