I recently looked harder at Franz Marc’s experiments with poetry. I think you could say that much of Marc’s writing borrows structurally from poetry, and Marc read a lot of poetry, including all of the classics you’d expect, work by people he actually knew, such as Gottfried Benn and Else Lasker-Schüler. He was also interested in French Symbolist Stéphane Mallarmé, particularly Un coup de dés jamais n’abolira le hasard of 1897, having extensively annotated a copy of the text; contact with Hugo Ball, who was influenced by Mallarmé’s text/design, probably heightened Marc’s attention.
From 1912 Marc made doodles of lines of the following poem here and there, and of course the last line is what Marc had originally intended to be the title of the painting we know as Tierschicksale (1914). But it was not until 1915 he wrote these phrases down all together in his small portfolio of drawings made in Germany and France, during the war. It’s hard to say what the poem means, especially in the context of the (approximately – some leaves may be lost) 35-page sketchbook’s compact animal images, it is very interesting. A translation is elsewhere but here is the original poem:
“…ein rosafarbner Regen viel [sic] / auf grüne Wiesen. / die Luft war wie grünes Glas. / das Mädchen [sah auf’s] blickte ins Wasser; das Wasser war klar [rein] wie Kristall; da weinte das Mädchen. / die Bäume zeigten ihre Ringe; die Tiere ihre Adern”.
(Abgedruckt in: Klaus Lankheit: Franz Marc: sein Leben und seine Kunst. Köln: DuMont 1976, S. 124.)