Cartoon
In stained glass, a cartoon is the full-size drawing of a window or panel, showing every piece of glass and every line of lead. It is the working plan from which glass is cut and the panel is built.
Medieval glaziers used chalk on a whitewashed table to draw their designs, and the panel was assembled directly on top of it. Later designers made detailed paper cartoons, and the design was often drawn by an artist, then transferred by a glass painter. From the cartoon, a second copy called the cutting line is made, and the pieces are numbered so that they can be put back together in the right place.
The word does not mean the same as cartoon in the sense of a comic drawing.