As I have got older, when I see something artistic, like that stained glass, I am conscious that it did not always exist. One or more people designed it, gathered the pieces of glass and prepared the pieces and fitted them together somewhere (where?) and then it was put into place (how big a task was that, how many people worked together to do that, how long did it take?) and then I imagine them, having put it in place, standing back and looking at it, then coming back at the time when the sun would be behind it and the effect would be seen in its magnificence.