Final answer:
Marcel Duchamp's L.H.O.O.Q. is a work of art that expresses the idea that works of art can be completely conceptual, focusing more on ideas rather than traditional craftsmanship.
Step-by-step explanation:
Marcel Duchamp's L.H.O.O.Q. is a work of art that expresses the idea that works of art can be completely conceptual—focusing more on ideas—as opposed to traditional craftsmanship. Duchamp used a readymade postcard of the Mona Lisa for L.H.O.O.Q., drawing a mustache on it. This act of adding a mustache to the Mona Lisa challenges traditional notions of artistic creation and highlights the importance of ideas in art.