The initial inspiration for the film was an outdoor glass elevator and the visual, spatial and gravitational possibilities it presented me with. The work was also informed by an interest in panoramas, the urban landscape, as well as the topography of San Francisco. Finally, the shape and character of the work was tempered by reflections upon a lifetime of displacement, moving from place to place and haunted by recurring memories of other places I once passed through. –Ernie Gehr
Ernie Gehr (born 1943) is an American experimental filmmaker closely associated with the Structural film movement of the 1970s. A self-taught artist, Gehr was inspired to begin making films in the 1960s after chancing upon a screening of a Stan Brakhage film. Gehr’s film Serene Velocity (1970) has been selected for preservation in the United States National Film Registry. Gehr served as faculty at the San Francisco Art Institute. His films are distributed by Canyon Cinema in San Francisco. —Wikipedia
So this is the weirdest "I'm going to film in an architectural way by reminding myself that it's only a movie, thus I'm allowed to reject the rules of gravity and time-scape" experiment but Gehr is a smarter ventriloquist and just knows how to manipulate your mindset by inviting you to a horizontal-vertical-in-between-of-the-two liturgy of...spatial freedom!