Delta Sketch

Wayne Thiebaud (b. 1920) Delta Sketch signed 'Thiebaud ?' (center right) ink, graphite and oil on paperboard image: 10 7/8 x 5 ½ in. (27.6 x 14 cm.) sheet: 11 ½ x 9 ½ in. (29.2 x 24.1 cm.) Executed circa 1999.