Michael Snow's notorious experimental classic (1967), consisting of a single, extended zoom (if anything moving at such a snaillike pace can properly be called a zoom) from one side of a loft space to the other. The aesthetic unfolding is engaging, also quite demanding, though I'm not convinced that letting your technical apparatus make the major decisions of your art is such a good formal idea. If nothing else, the film provides an inadvertent comment on the old classroom riddle of whether it's possible to have a one-word poem; no, the classical answer goes, because it wouldn't rhyme . . . and I'm not so sure that's as stupid as it sounds.