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http://www.openculture.com/2016/03/masterpieces-of-abstract-film-hans-richters-rhythmus-21-1921-viking-eggelings-symphonie-diagonale-1924.html
The First Masterpieces of Abstract Film: Hans Richter’s Rhythmus 21 (1921) & Viking Eggeling’s Symphonie Diagonale (1924)