Set including : - Hinüber (XXth), The tree and the bird, 1975, surrealist collage signed lower left, titled and dated (illegible) lower right (Height: 29 cm - Width: 22.5 cm); - Trees, silver photograph (Height: 16.5 cm - Width: 22 cm); - School of the XXth century, The tree, lithograph on paper signed, dated and numbered 16/50 in pencil at the bottom left (Height: 31,5 cm - Width: 23 cm).