Scribbles: Inverted curve (vertical). October 2005 Graphite Collection of Alessandro Maccaferri First Installation Galle

Four-part drawing with a different line direction in each part. September 1969 Black pencil Albright Knox Art Gallery, B

A square divided horizontally and vertically into four equal parts, each with a progressively darker gradation of gray.

Drawing Series— Part I-–IV, #1-–24, A B. (192 drawings). August 2006 Colored pencil Courtesy of the Estate of Sol LeW

Double Drawing. Right: Isometric Figure (Cube) with progressively darker graduations of gray on each of three planes; Le

Within a four-meter (160”) circle, draw 10,000 black straight lines and 10,000 black not straight lines. All lines are