For his next exhibition at the Iris Clert Gallery (April 1958), Klein chose to show nothing whatsoever, called La spécialisation de la sensibilité à l'état matière première en sensibilité picturale stabilisée, Le Vide (The Specialization of Sensibility in the Raw Material State into Stabilized Pictorial Sensibility, The Void): he removed everything in the gallery space except a large cabinet, painted every surface white, and then staged an elaborate entrance procedure for the opening night: the gallery's window was painted blue, and a blue curtain was hung in the entrance lobby, accompanied by republican guards and blue cocktails.