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Jack Chambers's 80-minute The Hart of London (1970) is a sprawling, ambitious film that combines newsreel footage of disasters, urban and nature imagery, and footage evoking the cycles of life and death.
Chambers told an early writer on the film, Avis Lang (whose article is reprinted in a 1984 issue on Chambers of the Canadian journal, The Capilano Review), that its whole theme of the film is "generation," and that's certainly present here, in the many juxtapositions of life and death and references to disasters.
Chambers follows this image with an overhead shot of the stone ruins of a very ancient city, another move from apparent ordinariness to ruin, returning to his theme of "generation" while also suggesting that decay is civilization's ultimate end.