In this short documentary by Chris Kridler, sculptors battle the weather and the clock to produce the Art of Sand festival, all for a fleeting but dazzling art that is destroyed within days of its creation. With time-lapse sequences, documentary footage and interviews with the organizers and artists, 'Hourglass' takes a fast-paced look at the effort and inspiration that go into building sand sculptures - and the eye-popping moments it takes to tear them down.