Striking mural-like effects can be achieved by exposing the surface aggregate of concrete using a sandblasting technique called Naturbetong developed in Norway. The technique was used to make up all the decorative surfaces for a modern church in Oslo. Using the technique, a wide range of surface textures may be produced through such devices as sandblasting to various depths, through the use of colored mortars, and by utilizing aggregates of varying size and shape. It is also claimed that because of the consolidation of coarse material as a separate operation, the exposed surfaces of the aggregate are unfailingly in a true plane. The method seems to offer good possibilities for a new expression of art. When handled by an artist, the sandblasting machine becomes an artist's tool comparable to the pencil and the engraving needle.