Picasso's enormous energy and fecundity was manifested by another development. In the 1920s he drew heavily on classical themes and produced magnificent monumental nudes and monsters that were reminiscent of antiquity and rendered with a certain anguished irony. These works appeared simultaneously with synthetic cubist paintings. Picasso was for a time saluted as a forerunner of surrealism, but his intellectual approach was basically antithetical to the irrational aesthetic of the surrealist painters.
The artist sought to strengthen the emotional impact of his work and became preoccupied with the delineation of agony. In 1937 the bombing of the Spanish town of Guernica impelled him to produce his second landmark painting, Guernica (Queen Sophia Center of Art, Madrid), an impassioned allegorical condemnation of fascism and war. Long held by the Museum of Modern Art in New York City, the work was transferred to Spain's Prado in 1981, and was moved to the Queen Sofia Center of Art, Madrid, in 1992. The profits Picasso earned from a series of etchings and prints on the Guernica theme made in the 1930s went to help the Republican cause.