The 19-minute film is a time-lapse video of the construction of the London International Hotel (now the London Marriott Hotel Kensington) at 147 Cromwell Road, Kensington. The film was made of photographs taken from a single point over a number of months in 1970 and 1971; Lennon sought permission to photograph the building's entire construction. The camera was fixed in place by Iain Macmillan, the photographer who captured the iconic Abbey Road album cover photograph. The footage was edited on 16 mm film by George Maciunas, founder of the Fluxus art movement and avant-garde contemporary of Ono.
When Lennon and Yoko appeared on the Dick Cavett Show on 11 September 1971, Lennon said that the inspiration for the film was when he would spend periods of time away from any particular city, he would return to find large buildings having been constructed. He also outlines how the film shows a single bush showing the seasons passing.
- Tillery, Gary (2009). The cynical idealist : a spiritual biography of John Lennon (1st Quest ed.). Wheaton, Ill.: Theosophical Pub. House. p. 96. ISBN 0835608751.
- Harry, Bill (2000). The John Lennon encyclopedia (1. publ. ed.). London: Virgin. p. 234. ISBN 0753504049.
- "Erection (John Lennon & Yoko Ono, 1971)". Postiar. Retrieved 15 October 2014.
- Womack, Kenneth (2014). The Beatles encyclopedia : everything fab four. p. 593. ISBN 0313391726.
- "Oh Yoko: Four by Yoko Ono". Cinema Project. Retrieved 15 October 2014.
- Bloch (ed.), Avital H.; Umansky (ed.), Lauri (2004). Impossible to hold : women and culture in the 1960s. New York: New York University Press. p. 233. ISBN 0814799108.
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