In 1910–1914, he took part in the arts group Soyuz Molodyozhi created by artists Elena Guro and Mikhail Matyushin. In 1912, he wrote the article The Canon and the Law, in which, he formulated the principles of analytical realism, or "anti-Cubism". According to Filonov, Cubism represents objects using elements of their surface geometry but "analytical realists" should represent objects using elements of their inner soul. He was faithful to these principles for the remainder of his life. During the years 1913 to 1915, Filonov was close to Vladimir Mayakovsky, Velimir Khlebnikov, and other futurists. He co-illustrated Khlebnikov's Selected Poems with Postscript, 1907–1914 alongside Kazimir Malevich during this time. In the autumn of 1916, he enlisted for service in World War I, and served on the Romanian front. Filonov participated actively in the Russian Revolution of 1917 and served as the Chairman of the Revolutionary War Committee of Dunay region.In 1919, he exhibited in the First Free Exhibit of Artists of All Trends at the Hermitage. In 1923, he became a professor of St. Petersburg Academy of Arts and a member of the Institute for Artistic Culture . He organized a large arts school of Masters of Analytical Realism (over seventy artists). Their work influenced suprematism and expressionism.
In 1929, a large retrospective exhibition of Filonov art was planned at the Russian Museum; however, the Soviet government forbade the exhibition from going forward. From 1932 onward, Filonov literally starved but still refused to sell his works to private collectors. He wanted to give all his works to the Russian Museum as a gift so as to start a Museum of Analytical Realism. He died of starvation on December 3, 1941 during the Nazi Siege of Leningrad. Under the umbrella of Universal Flowering, Filonov put forth a manner of working that proceeded from the particular to the general. He believed that objects and fields should be built up from small details and bits and stated that doing it the other-way-round was nothing short of "charlatanism". To this end, he worked, and required his students to work, with very small brushes in painting and the finest of points when drawing. Wikipedia