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 were explained as having been put there to increase the running time. As a university student, Buñuel had studied entomology at the Museum of Natural History under the famous naturalist Ignacio Bolívar, and he had an early and lasting interest in the scientific documentaries of Jean Painlevé, which he tried to screen at the Residencia de Estudiantes. Numerous critics have commented on the number of sequences in his films involving insects, from the death's head moth in "Un chien andalou" and the extended scorpion scenes in "L'Age d'or" to the framed tarantula in "Le Fantôme de la liberté". Others have