A new technique for obtaining original finish of site-cast concrete has been developed by a Norwegian architect. The technique, which has been used by the architect for a number of small buildings in the past, was used extensively on a 17 story office block completed recently in Oslo. It might be described as a refinement of the intrusion method of placing concrete, coupled with sandblasting. The inventor calls the resulting textured surface "natural concrete." The technique allows a considerable saving in weight. Other advantages are that joints between lifts are almost impossible to detect and creep is eliminated. If faults do occur they are easily corrected and concealed. The technique has proved highly competitive with traditional construction.