César, also occasionally referred to as César Baldaccini, was a noted French sculptor.

Nouveau réalisme is an artistic movement founded in 1960 by the art critic Pierre Restany and the painter Yves Klein during the first collective exposition in the Apollinaire gallery in Milan. Pierre Restany wrote the original manifesto for the group, titled the "Constitutive Declaration of New Realism," in April 1960, proclaiming, "Nouveau Réalisme—new ways of perceiving the real." This joint declaration was signed on 27 October 1960, in Yves Klein's workshop, by nine people: Yves Klein, Arman, Martial Raysse, Pierre Restany, Daniel Spoerri, Jean Tinguely and the Ultra-Lettrists, Francois Dufrêne, Raymond Hains, Jacques de la Villeglé; in 1961 these were joined by César, Mimmo Rotella, then Niki de Saint Phalle and Gérard Deschamps. The artist Christo showed with the group. It was dissolved in 1970.