Final answer:
Marcel Duchamp's Fountain, a porcelain urinal classified as a readymade sculpture from 1917, challenged traditional definitions of sculpture and influenced subsequent art movements.
Step-by-step explanation:
Marcel Duchamp's Fountain is an example of a sculpture. This iconic work of art was created in 1917 as part of Duchamp's 'readymades' series, where everyday objects were repurposed and declared as art by the artist. Duchamp's Fountain is a porcelain urinal that was signed and submitted to the Society of Independent Artists exhibition. It challenged the prevailing definition of sculpture and has since greatly influenced modern and contemporary art movements such as Pop Art, Fluxus, and Conceptual Art. The piece's radical redefinition of sculpture brought up fundamental questions regarding artistic creation and the nature of art.