Rivers and Tides is a superb documentary, a unique collaboration of artist Andy Goldsworthy and filmmaker Riedelsheimer. This review is for the Special Collector's Edition, which adds 7 short pieces shot during the making of the film, focussing on specific Goldworthy pieces and overlapping with the main film somewhat. The second disk features an illuminating 45-minute interview with Riedelsheimer, where he describes the process of making the film and reflects on Goldsworthy and Evelyn Glennie as subjects and as artists. (His next film after Rivers and Tides was Touch the Sound, which follows Glennie in the same way that the earlier film follows Goldsworthy, and is equally fascinating; another link between the two is Fred Frith, who collaborates with Glennie in the second film and did the music for Rivers and Tides.) Riedelsheimer is very thoughtful and articulate (his English is impeccable), and the interview is well edited, with some footage from the film inserted to give it more visual interest. The other bonus on the second disk documents a more recent Goldsworthy project involving giant snowballs in London on Midsummer Day; it's interesting, but both sound and video quality are crude compared to the rest of this Special Edition. It's all worth seeing, but the price is rather high for what you get, unless you can get it at a deep discount. That's the only reason i'm giving this package less than 5 stars. At $20 this would be a great buy if you like contemplative cinema.