Kozłowski is a legend in Polish conceptual art. Already long before the Cold War period had come to an end, his studio opened a window towards Western Europe: in the early 1970s, he established the artist network NET with over 350 international artists (thereby also arousing the interest of the secret service) and was a central protagonist of the Fluxus movement in Poland. In 1977, he organised a Fluxus festival at the gallery Akumulatory 2 (1972–90) that he founded, exhibiting the artists Richard Long, Reiner Ruthenbeck, Franz Erhard Walther, Victor Burgin, and Douglas Huebler, among others.