The camera position remained the same throughout the shooting. The frame is comprised entirely of sky. Four one hundred foot rolls of colour film were run through the camera twelve times each, one twelfth of the frame was exposed at every run. Each run was divided into four second takes. Each of these was punctuated by four second intervals which are represented by flash frames. The four second takes are synchronised in each run so that the flash frames at the end of each take occur on the screen at about the same time.

The order in which each separate area of film was exposed was dependent upon the overall distribution of clouds within the frame. The time taken to expose each of the four rolls of film depended on the weather conditions at the time, and varied between one and fourteen days per hundred feet.