Concentric arcs whirl around one another, high above the viewer. Powered by a massive swinging counterweight pendulum below and supported by two arching columns, the metallic arcs rotate in chaotic yet comprehensible ways, each tracing out spherical volumes in the sky in reference to the earliest celestial models. Colored translucent panels throughout the work filter sunlight and create colored shadows on the ground plane. Two hanging cords encourage viewers to drive the motion of the work, either together or individually.