Convolute of 4 original works by different artists 2nd H. 20th century, Hans Schellenberger (1946-2007), surreal pencil drawing ''Landscape I'', revised paper collage signed and dated ''len 71'', sketchy landscape sketch in watercolor on charcoal, unsign, as well as abstract, figural composition in ink over charcoal on paper, u. re. indistinctly signed, in each case behind glass ger. up to 76 x 54 cm