The term geometric is applied to the group of leaded-glass shades with the simplest designs, and includes standard geometric shapes such as squares, triangles, rectangles, ovals, ellipses, and rhomboids used on panel, cone, and globe-shaped shades. Unlike blown shades, the geometric and all ensuing groups were fabricated from pieces of poured glass cut in segments, edged with copper foil and leaded or soldered together to form a complete unit. A patinated bronze finish was then applied to the lead or solder lines. The geometric group is divided into two basic types: shades made from a large number of small glass pieces and those made from a limited number of large glass pieces, such as turtleback tiles and Favrile Fabrique panels.
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