Threshold (1972)

Le Grice no longer simply uses the printer as a reflexive mechanism, but utilises the possibilities of colour-shift and permutation of imagery as the film progresses from simplicity to complexity… With the film’s culmination in representational, photographic imagery, one would anticipate a culminating “richness” of image; yet the insistent evidence of splice bars and the loop and repetition of the short piece of found footage and the conflicting superimposition of filtered loops all reiterate the work which is necessary to decipher that cinematic image. - Deke Dusinberre

Threshold has a runtime of 13 minutes.