Ruth WOLF-REHFELDT was a key figure in the Mail Art movement, in which women were rather rare. She would send her creations to her international contacts in the Mail Art networks and invited them to intervene with the works and return them: “Mail Art was a kind of safety valve, and, too, a certain satisfaction." she has stated. "I was never able to travel, but I was glad that I had contact throughout the world that all the others who were allowed to travel sometimes didn’t have.”
Among the others, she established a correspondance with Paulo BRUSCKY, with whom she exchanged works incessantly in the 1970s and 1980s, creating a connection between dictatorship-era Brazil and East Germany.