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"This neat, finely tuned, hypersensitive film examines the outside and inside of a banal prefab classroom, stares at an asymmetrical space so undistinguished that it's hard to believe the whole movie is confined to it, and has this neck-jerking camera gimmick that hits a wooden stop arm at each end of its swing. Basically it's a perpetual motion film that ingeniously builds a sculptural effect by insisting on time-motion to the point where the camera's swinging arcs and white wall field assume the hardness, the dimensions of a concrete beam."In such a hard, drilling work, the wooden clap sounds are a terrific invention, and, as much as any single element, create the sculpture. Seeming to thrust the image outward off the screen, these clap effects are timed like a metronome, sometimes occurring with torrential frequency." - Manny Farber, Artforum, 1970