The document discusses philosophical changes in art from the 18th century to the 20th century. It notes that the Romantics began emphasizing individual expression and the "now" over classical traditions. This focus on innovation and the present came to fruition in the 20th century with Modernism. Modernism philosophically emphasized scientific reasoning, avant-garde forms, and abstract reinventions of previous styles. The document then analyzes several influential 20th century art movements including Expressionism, Cubism, Futurism, Abstraction, Suprematism, and Dada/Surrealism and highlights pioneering artists associated with each movement.