Two pivotal motions to the right and left of center points, recorded by graphite bar on paper and time lapse photograph

Blythe Bohnen, Two pivotal motions to the right and left of center points, recorded by graphite bar on paper and time lapse photograph, 1968. Gelatin silver print and graphite on paper mounted on board, mount (board): 22 × 14 in. (55.9 × 35.6 cm). Whitney Museum of American Art, New York; gift of Paula and Herbert R. Molner 2007.163