This tapering, four-sided kaleidoscope extends through the ceiling of the Geffen to provide a view of the atmosphere above the museum. The square opening at the top frames a patch of sky that is reflected in the mirror walls and, because of the angles of the mirrors, seems to curve off in all directions to form a sphere. The colours of the work change with the weather and the time of day. On especially clear Californian days, a pristine blue planet appears to float in the air above the visitors’ heads. At dawn and dusk, the vibrant colours fade from one side to the other, adding surprising dimension to the many reflections. Clouds, birds, or airplanes passing above interrupt the monochromatic field and are repeated rhythmically over and over, belying the illusion of a static polyhedron.