Getting the actual glass right was to be another challenge as Leonie explained: “Due to building regulations in Texas all new public buildings must include a special energy saving glass. This outer layer of glass has a distinct greenish-brown hue, which meant that we had to choose brighter colours for the stained glass to counteract that. Another challenge was that modern production is so refined that there are very few imperfections in the colours or thickness and we worried that this would deaden the final design. So we contacted the glassblowers who supply us and asked them if it was possible to recreate those lovely variations that you can see in the original medieval glass. And they did. It meant a lot of unlearning for them and some trial and error, but eventually they managed to un-refine their process and produce this marvellous glass.”
The final design features three narrow arched windows with three rosettes above. The central lancet depicts the end of the Passion story from the Crucifixion to the Resurrection and then the Ascension with stories from the Old Testament, including Abraham sacrificing his son (pictured right), on either side.