Sketching a Design onto a Piece of Paper
To make a perfect copy of an ancient mosaic, a sheet of tracing paper is placed directly onto the mosaic so that the exact outlines of each tessera and interstice may be marked with a pen. An easier technique requires a color reproduction of the mosaic, in which the tesserae are clearly visible. A design may also reinterpret a classical motif, or be an original creation. Transposing a painting into a mosaic is more complex. It needs great sensitivity on the part of the mosaicist, to harmonized the distribution of the tesserae.