Apotheosis (1970)

Yoko Ono fixed a camera, pointing downward, to a weather balloon and released it. As the balloon begins its ascent, we see Ono and husband John Lennon sitting on a Central Park bench. Several minutes into the film, the balloon enters a bank of clouds, eradicating the image for several more minutes, when it emerges from the clouds, the view from above them is spectacular. This single-reel movie ends at the point when the camera ran out of film.