格拉魯斯州
In 1857 he produced the notable painting "Die Kuh im Krautgarten" ("Cow in the Vegetable Garden"). He became friends with the Swiss "Bildungsroman" novelist Gottfried Keller, the cultural historian Jacob Burckhardt and the novelist and playwright Friedrich Theodor Vischer. During 1858, Koller travelled to the Swiss Canton of Glarus; his work "Richisau" dates from this trip.