This is the story of Marcel Duchamp and how the Dada art movement changed the way people thought about what art could be, and what could be art. From drawing a moustache on the Mona Lisa to attaching a bicycle wheel to a stool, Duchamp’s work challenged long-held notions of art and how it should be made. People were amused, confused, and sometimes offended, and that was just the way Marcel Duchamp liked it.