Beveled Glass Window

I created this window for an elevator door in a home around 30 years ago. I believe it is the first time I started using extended lines in my work.

Traditionally, the lines in art glass stop when they connect to another line. I believe the extensions developed in my design process of drawing lines on paper, erasing, redrawing and finally realizing in seeing the new lines overlaying the shadows of erased lines, the possibility of a new design element.