She set the cameras so they would remain open to the light of the night sky.
VOA: special.2009.05.17
Comprised of a surface pattern of triangles-like those in the main theater, but made in this case out of 1, 067 thin aluminum panels, mounted on the support structure with open joints-the light-blue facade looks razor-sharp but creates the impression of a super-light floating skin dematerialized against the sky: another visual reference in the architecture to the infinite thinness of the moving image.
Shortly after the movie started, they and others noticed the emergency exit door to the audience's right swing open, spilling light from an outside lamp into the darkened theater.