The Scottish artist Andy Goldsworthy fashions natural materials into ephemeral artworks, assembling rocks into egg-shaped cairns, filling riverside rock-pools with fiery flowers and stitching thorns and twigs into intricate web patterns. An original work and a few photographs of his other creations are tucked away in a corner of Southampton art gallery (near where I live), but although I found these pieces intriguing, I only realised the wonder of Goldsworthy's work when I was lucky enough to catch a re-screening of Rivers and Tides.<br /><br />Thomas Reidelsheimer's film, accompanied by a beautiful instrumental soundtrack by Fred Frith, brings Goldsworthy and his art to life by showing the artist at work. The opening scene captures him fusing icicle fragments into a snake-like thread set atop a tree-stump. Working with his teeth and bare hands, Goldsworthy crafts a beautiful, ephemeral work. Before long this delicate sculpture melts away to nothing in the brilliant Nova Scotian sunlight. This scene is among the most beautiful in the film, but the breadth and inventiveness of Goldsworthy's work is remarkable. Reidelsheimer shows both the successes and the failures, capturing the frustration of pieces that collapse before they are completed as well as the glory of those that shine, even if for just a few hours, minutes or seconds.<br /><br />Goldsworthy himself provides the narration, speaking slowly but thoughtfully about the themes in his work. He makes plain his need to work with nature, to be alone in it and to further his understanding of it through trying to work with natural materials, even when they seem to be working against him. At times he is down-to-earth and humorous; at other times he struggles for the words to express his purpose  something which is quite understandable when witnessing his astonishing work first hand. The 'Rivers and Tides' of the title become increasingly pertinent as we see the natural materials pass through the artist's hands, flowing from one form to the next. The capture of the creation and dissolution of Goldworthy's work is in itself a striking piece of art.<br /><br />Although Goldsworthy works with widely varying materials and covers territory across North America and Europe, the presentation of artworks one after the other in this film is exhausting; it gave me the same feeling of fatigue that I get when I spend too long in an art gallery and struggle to take in anything new. A brief interval in which we are introduced to Andy's family and hometown is all that breaks the long succession of his artworks. Nevertheless, Reidelsheimer does a superb job in photographing Goldsworthy and his creations, locating them in their wider environments, from meandering Canadian rivers to rainy Scottish hillsides. Fittingly, the film ends with Goldsworthy casting handfuls of earth and snow into the sky. Fleeting patterns emerge from the dust particles even as they dissipate into the air; this is the purest expression of the beauty to be found in the work of this remarkable artist.