Poster art in Poland, celebrated as the Polish School, is highly acclaimed around the world for its innovative expression. Poland had been under Communist rule since World War II, but starting in the mid-1950s, a new generation of artists, including filmmakers, promoted a form of free expression that was no longer constrained by social realism. This is when Jan Lenica, together with Roman Cieślewicz, Henryk Tomaszewski, and others, rose to prominence.