Wavelength is a 45-minute film that made the reputation of Canadian experimental filmmaker and artist Michael Snow. Considered a landmark of avant-garde cinema, it was filmed over one week in December 1966 and edited in 1967, and is an example of what film theorist P. Adams Sitney describes as "structural film", calling Snow "the dean of structural filmmakers." Wavelength is often listed as one of the greatest underground, art house and Canadian films ever made. It was named #85 in the 2001 Village Voice critics' list of the 100 Best Films of the 20th Century. The film has been designated and preserved as a masterwork by the Audio-Visual Preservation Trust of Canada. In a 1969 review of the film published in Artforum, Manny Farber describes Wavelength as "a pure, tough 45 minutes that may