In late 1965 Rickey extended his vocabulary from lines to planes, creating evocative drawings in space that further focused on the motion of the work. Two Planes Vertical-Horizontal II takes the moving square as its subject. Two internally weighted shallow boxes made of burnished stainless steel pivot on either side of a similarly burnished pole to which they are attached. As in Rickey’s Six Lines in a T, the planes that comprise the work are compound pendulums—objects with weights above and below the pivot point—that move along parallel paths.