This is a double exposure, the gull was actually shot in an open sky. If this were shot with a better camera, you would see Toronto protruding at the center of the horizon.
I took this picture(s) at Monsters of Nature and Design II a performance that took place outside the Albright-Knox Art Gallery on September 5th. The finale featured the dropping of a piano from a crane onto another piano. This image captures the before and after.