Claim: Claim using highlight: (False):  Berlin: Die Sinfonie der Großstadt, a 65-minute experimental documentary by Walter Ruttmann (the most important German representative of abstract experimental film), was released in 1927.
Evidence: Walter Ruttmann (28 December 1887 – 15 July 1941) was a German cinematographer and film director, and along with Hans Richter, Viking Eggeling and Oskar Fischinger was the most important German representative of abstract experimental film. Together with Erwin Piscator, he worked on the film Melody of the World (1929), though he is best remembered for Berlin: Die Sinfonie der Großstadt (Berlin: Symphony of a Metropolis, 1927). Berlin: Die Sinfonie der Großstadt (1927) in collaboration with Alberto Cavalcanti