30.5.1999, 1999 Graphite on paper 11 7/8 x 8 1/4 in. Permanent loan from a German Private collection, Courtesy Kunsthalle Emden I highly recommend the exhibition "Lines which do not exist" at The Drawing Center in Soho. Loved the energy that came out of them. Most drawings are in graphite, and the lines and marks go from crisp to blurry, constantly pulling you in and out. I liked how he used the eraser to make marks too.  Untitled, 1966 Graphite on paper. 8 13/16 x 6 7/16 in. Courtesy of Winterthur, Kunstmusem Winterthur 1.6.1999, 1999. Graphite on paper. 8 1/4 x 11 11/16 in. Courtesy of Winterthur, Kunstmuseum Winterthur  These two are much larger and part of a group of 4 that's beautifully displayed on the gallery's back wall, at human height , so you feel like you can almost walk into them: Drawing II, 2005 Graphite on Paper 59 1/2 x 40 3/8 in. Collection of Donna and Howard Stone  Drawing III, 2005 Graphite on paper 59 1/2 x 40 3/8 in. Collection of Donna and Howard Stone There are also a few stunning ones in very densely pigmented ink and watercolor that are worth seeing: G. EL. 2, 18.1, 1984, 1984 Watercolor on paper, 7 x 9 5/16 in. Private Collection, Berlin 22.3.88, 1988 Colored ink and watercolor on paper 6 1/2 x 9 3/8 in. Courtesy of the Museum of Modern Art, New York, Gift of the International Council in honor of H.R.H. Prinz Franz von Bayern, 1989 The reproductions here don't do the artwork justice - go see the show if you can - it's up til November 18, 2010. More info here.