Experimental film shorts. Fernand Léger, Dudley Murphy, and Man Ray created the film "Ballet Mécanique" (1924), sometimes described as Dadaist, Cubist, or Futurist. Duchamp created the abstract film "Anémic Cinéma" (1926). Alberto Cavalcanti directed "Rien que les heures" (1926), Walter Ruttmann directed "" (1927), and Dziga Vertov filmed "Man With a Movie Camera" (1929), experimental "city symphonies" of Paris, Berlin, and Kiev, respectively. The most famous experimental film is generally considered to be Luis Buñuel and Salvador Dalí's "Un chien andalou" (1929). Hans Richter's animated shorts, Oskar Fischinger's abstract films, and Len Lye's GPO films would be excellent examples of more abstract
Filmmaking technique of Luis Buñuel for example, combining the sound of gushing water with an image of a stagnant pool, or exaggerating the volume level of chiming bells. Music is an important part of Buñuel's early films, to such an extent that, for his one silent film "Un Chien Andalou", in his sixties, he took the trouble to create a sonorised version. He based this version on the music (Wagner, a South American tango) played at its original screening. "Un Chien Andalou" was his first film—made in the silent era—and was called "the most famous short film ever made" by critic Roger Ebert. One critic