These panels are constructed in the copper foil method of stained glass popularized by Tiffany and John La Farge in the late 19th century, enabling creation of three-dimensional works (lamps, boxes etc.), in addition to two-dimensional works to which the lead came method is limited. The copper foil artwork is commonly called Tiffany stained glass. Each piece of glass is cut and ground to fit the pattern then wrapped with a sticky back copper foil. The foil is what the solder adheres to and that's what holds the pieces together.