arnoldi is educated schoolteacher and worked as such for a short time before his interest in and engagement with painting, design and art became his primary occupation. he is best known for his poster art and in particular his dsb train posters from 1975 onwards became public darlings in denmark. he worked with the magazine mobilia (about modernist furniture, interior decoration and crafts) for about 10 years, learning the craft of graphic design. as a painter, arnoldi is autodidact and he exhibited for the first time in 1961, twenty years old.