I made the Mosaic Map of the Ancient and Medieval World on three panels of marine plywood. A paper cartoon was laid over each panel and outines of land masses, oceans,etc. were traced through. I used P.V.A. glue to adhere glass to the wood. After the outlines were mosiaced with lines of tiny pieces, I filled in the surrounding areas with larger pieces. No two pieces are the same.
The pieces are made from molten glass which is poured onto tables and then rolled into thin sheets of various colors and textures. The sheets are purchased by mosaic artists. With glass cutters and special pliers the sheets are reduced to strips which are cut again into squares, rectangles, and other small shapes. These pieces, called tesserae, are then sorted by size and color. The main colors in the map are green for land, blue for water, and cream for deserts.
At the Walters Art Museum, the three panels and a wave border were joined and then secured permanently to the wall. The Map measures 9' x 12' and contains over 150,000 glass tesserae.