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Cameos can be carved in relief or intaglio. In relief is the most popular and means that the surrounding material is cut away from the image being carved, allowing the image to project above the surface. Intaglio means that the image is carved into the stone, so that it is below the surface level. When intaglio is done on a stone, the smooth surface of the top of the stone is carved. When intaglio is done on a piece of glass, the bottom surface of the glass is "carved" and usually painted, leaving the top of the glass smooth.