Once a client (most often acquired through internet sales, the domain of Terraza's daughter Florencia) settles on a design (often by daughter Melina), artisans set about finding glass that most closely matches its colors. They produce two identical, full-size maps of the piece that look paint-by-numbers patterns. One is cut into pieces that are affixed to bits of colored glass that are then shaped to match the pattern precisely with ring saws and grinders. The company donates the leftover glass scraps to mosaic artists.