Marcel Duchamp's urinal art, Fountain. Marcel Duchamp/Artists Rights Society (ARS), New York/ADAGP, Paris/Succession Marcel Duchamp © 2005
"In 1917, Duchamp created one of his "ready-made" works -- again in the spirit of challenging what society defined as art. A mass-produced object -- in this case a sparkling white porcelain urinal bought from a plumbing supplier -- was turned on its side, signed, and called "Fountain." When Duchamp tried to enter it in a New York exhibition, it was refused. Paris museum director Alfred Packmon observes that Duchamp and the Dadaists were making the point that art was no longer just a nice bunch of flowers on the wall: "The artist is the person who decides what is art and what is not art.”
Dada was a moral and ethical response to the slaughter of World War I. In grief, rage, and despair, Dada used art to comment on the world, making art an indictment of the hypocrisies that wiped out a generation." NPR