21-87 is a 1963 Canadian abstract montage-collage film created by Arthur Lipsett that lasts 9 minutes and 33 seconds.[citation needed]

The short motion picture, produced by the National Film Board of Canada, is a collage of snippets from discarded footage found by Lipsett in the editing room of the National Film Board (where he was employed as an animator), combined with his own black and white 16 mm footage which he shot on the streets of Montreal and New York City, among other locations.[citation needed]

21-87 has had a profound influence on director George Lucas and sound designer/editor Walter Murch, with Lucas stating that it was "the kind of movie I wanted to make — a very off the wall, abstract kind of film".[1]

The cinematic-film strongly influenced Lucas in the aesthetic and style for the Star Wars movies, as well as a number of his other works, including American Graffiti and his pure cinema short 16mm movies 6-18-67, 1:42.08, Look at Life, his short motion picture Electronic Labyrinth: THX 1138 4EB, and the feature movie it inspired, THX 1138.[citation needed]