Which work by Marcel Duchamp, presented in 1917, caused a major scandal?

Fountain

Marcel Duchamp's work "Fountain," submitted under the pseudonym "R. Mutt," sparked one of the greatest debates on the nature of art in the 20th century. By presenting an industrial urinal as a piece of art, Duchamp challenged artistic conventions and raised fundamental questions about artistic creation and perception. This move ushered in the era of conceptual art, where the idea prevails over the physical object. The controversy surrounding "Fountain" paved the way for generations of artists to explore new frontiers, making Duchamp a pioneer of the avant-garde.