Mise-en-scène - The Frame
Film: 2001: A Space Odyssey (1968)
Dir. Stanley Kubrick
"The widescreen is particularly suited to capturing the vastness of a locale. If this scene were cropped to a conventional aspect ratio (middle gif), much of the feel of the infinity of space would be sacrificed. We tend to scan an image from left to right and hence, in Kubrick’s composition (above gif) the astronaut seems to be in danger of slipping off into the endlessness of space. If the composition is turned upside down, however, (below gif) the astronaut seems to be coming home into the safety of the spacecraft.”
Source: Giannetti, Louis D. Understanding Movies second edition.