Jacobsen's
Jord og jern, written in
free verse, introduced the urban world, racing cars, airplanes, and electrical turbines. Because of the choice of his subjects Jacobsen's work was connected to Marinetti and
Futurism, but his view was all but romantic. He did not share the Futurists' euphoria over modern inventions, the beauty of "a roaring motorcar, which runs like a machine-gun," but saw the relationship between machines and human civilization as more complex. Jacobsen's diverse literary and other artistic influences included the
Poetic Edda,
Karel Čapek's play
R.U.R., and
Carl Sandburg's poetry. The title of the collection also suggests a cyclic relationship between nature and technology. In 1934 Jacobsen returned to Åsnes to take care of his father. He had joined a
socialist intellectual group,
Clarté, and in Åsnes he became a member of the
Labor Party Leadership for
Hedmark County. In Åsnes, Jacobsen worked for the daily newspaper
Kongsvinger Arbeiderblad, which was supported by Labor. Jacobsen's second collection of poems,
Vrimmel (1935), revealed his underlying dismay at modern civilization. Jacobsen rejected
Marinetti's
manifesto, "We wish to glory war...", but predicted the ominous emergence of the gas masks and machine guns. After
Vrimmel, Jacobsen was silent as a poet for 16 years. == German Occupation years==