Yves Klein (1928-1962)Untitled, with Pierre Restany, Untitled, from N.R. (Nouveaux realists) Portfolio (2 works), 1973Screenprint on mylar overlay on colored laid paper, contained in 14 page introductory booklet that accompanied the N.R. (Nouveaux Realists) Portfolio, justification page signed in pencil by editor Attilo Codognato, with typographic number 194 (the edition was 600), WITHPierre Restany, Untitled, screenprint on wove paper, signed in pencil and numbered 194/600, contained in original cardboard envelope printed with the initials of the publisher, Ars Viva Edition, Milan, both the full sheets. (2 works)19 1/2 x 19 1/2in (49.4 x 49.4cm) (folded), 19 1/2 x 30in (49.4 x 76cm) (unfolded); 19 1/2 x 19 1/2in (49.4 x 49.4cm)Footnotes:In 1960, the critic Pierre Restany formed a loose collective called 'Nouveau Realism' (new realism). Its members used existing materials such as discarded posters, and readymade objects to create collages and assemblages (they acknowledged their debt to Marcel Duchamp). The leading proponents (also called the school of Nice) were Arman, César, Christo, Yves Klein (who died prematurely in 1962), Jean Tinguely and Niki de Saint Phalle. Other members included Daniel Spoerri. Raymond Hains, and Mimmo Rotella. The Nouveaux Realists portfolio was created to codify the artistic practices and credo of its members.