Kinetic art is art that contains moving parts or epends on motion for its effect. The moving parts are generally powered by wind, a motor or the observer. The term kinetic sculpture refers to a class of art made primarily from the late 1950s through 1960s. Kinetic art was first recorded by the sculptors Naum Gabo and Antoine Pevsner in their Realist Manifesto issued as part of a manifesto of constructivism in 1920 in Moscow. "Bicycle Wheel," of 1913, by Marcel Duchamp, is said to be the first kinetic sculpture.