Clouds 1969 by the British filmmaker Peter Gidal is a film comprised of ten minutes of looped footage of the sky, shot with a handheld camera using a zoom to achieve close-up images. Aside from the amorphous shapes of the clouds, the only forms to appear in the film are an aeroplane flying overhead and the side of a building, and these only as fleeting glimpses. The formless image of the sky and the repetition of the footage on a loop prevent any clear narrative development within the film. The minimal soundtrack consists of a sustained oscillating sine wave, consistently audible throughout the film without progression or climax. The work is shown as a projection and was not produced in an edition. The subject of the film can be said to be the material qualities of film itself: the grain, the light, the shadow and inconsistencies in the print.