The emergence of mail art in Poland in the beginning of 1970s coincided with the popularization of neo-avant-garde and conceptual art in the region. Its first comprehensive theocratization came with the NET manifesto written by Andrzej Kostołowski and Jarosław Kozłowski in 1971 which proposed a creation of a network of exchange of art that was based on openness, engagement, expansion and decentralization. At the same time the transformation of the political landscape in the country followi...