Stained glass is fabrication to a drawing. A full-size pattern sets every line, and each piece of glass has to be cut and ground to that line. Small errors add up across a panel: if pieces run large, the came will not close around them, and if they run small, the panel ends up loose and out of shape.
Each of these panels began with an image I wanted to build: the rear of the DeLorean from Back to the Future, my favourite movie; the old Shelby logo; and the logo of Hindu Temple St. John's.