Pioneering sound/video collage artist Christian Marclay's "The Clock" (2010) is a 24-hour montage of appropriated film clips related to time. OK, I'll admit that I haven't seen the whole piece, but the chunks I've watched are fantastic. Above is a phonecam recording of some of it, recording at one of its installations. The Clock will be on view at the SFMOMA starting April 6, which is appropriate given the museum's imminent closure in June for (gasp) three years of construction. "SFMOMA Presents Christian Marclay’s 24-Hour Cinematic Masterpiece The Clock"