Ludwig Hohlwein, Zoo Poster with a red flamingo, 1925. Ludwig Hohlwein (27 July 1874 in Wiesbaden - 15 September 1949 in Berchtesgaden) was a German poster artist. He was trained and practiced as an architect until 1906, when he switched to poster design. Hohlwein's adaptations of photographic images was based on a deep and intuitive understanding of graphical principles.