Using the colours of the glass to play with the light. Whether in the sun or shade.
I’m an Architect/ xPlanner who did an evening class in Bristol for 3 years with Mark Angus many years ago. We also went to Swansea College end of year exhibition and week’s course with various SG artists (Johannes Schreitrer, Klos, etc). Three of us also had several “long weekend” trips to German SG Museum in Linnich and various modern SG in nearby churches (inc Munster).