Benefitting from the advent of postcards, Mary Willumsen (1884–1961) photographed women in scanty clothing or nude at the Helgoland beach facility in Copenhagen. Between 1916 and 1920, she took many such photographs which she sold at a nearby kiosk. The operation was discontinued when the police began to take an interest. Many of the compositions are now considered to have considerable artistic merit."Mary Willumsen", Den store Danske. Retrieved 7 February 2010."Politihistorisk Museum udstiller Mary Willumsens erotiske billeder", Politi.dk, 26 September 2006. Retrieved 7 February 2010.
