In many ways architectural concrete in Norway captures the feeling and the force of the rugged Norwegian countryside. And this is not surprising since Norway boasts a wide range of beautiful aggregates and these are exploited to the full to provide outstanding finishes. Probably the one man who has done more than anyone else to promote this effect and to utilize this remarkable variety of aggregates is an architect, Erling Viksjo. Viksjo is renowned primarily for his development of Naturbetong, a technique in which the coarse aggregate is first compacted into the form after which a cement/fines slurry is pumped in upwards, and, finally, the surface skin is removed by sand-blasting, completely or in patterns, to reveal the aggregate. Viksjo's work has received wide attention in recent years and after his success with Naturbetong he turned to another technique in which he inserted large selected rocks into the mix, then cut them away with a diamond saw, after which he wet-polished the surface. His latest technique, Ferrobetong, uses coarse aggregate of stainless steel with colored cement to give exceptionally attractive polished surfaces. Examples of these finishes can be seen in Oslo on the Elkem building where Ferrobetong is used both on the interior and exterior.