en Cuevana 3. A single thread of 16mm film runs through three side-by-side projectors, all aimed at the same wall. Twenty-two and a half second elapse between the time when the first and the second screen images appear and the same amount of time passes between the appearance of the same silent image in the second and third, so that every image can be expected to occur twice in each 45-second cycle. (Jonathan Rosenbaum)