Raoul Vaneigem (as Jules-François Dupuis), A Cavalier History of Surrealism page 81

The adventure of the arts (painting, sculpture, literature, music) passes in its decline through three essential phases: a phase of self-liquidation (Malevich's "white square", Mutt/Duchamp's urinal rebaptized "Fountain", Dadaist word-collages, Finnegans Wake, certain compositions by Varèse); a phase of self-parody (Satie, Picabia, Duchamp); and a phase of self-transcendence, exemplified in the directly lived poetry of revolutionary moments, in theory as it takes hold of the masses, or in this notice posted on Saragossa Cathedral by Ascaso and Durruti, and followed up by the action announced: "Having learned that injustice reigns in Saragossa, Ascaso and Durruti have come here to shoot the Archbishop."