Yves Klein
Dufrene became friends with Yves Klein in 1950 and with Raymond Hains and Jacques Villeglé in 1954. In 1957 he discovered décollage and in 1960 - with Pierre Restany, Yves Klein, Jean Tinguely, Arman, Hains and Villeglé - and helped found the art group known as Nouveau réalisme. He is considered one of the important artists in that Neo-Dada art movement.