This is an interesting question. Let's see if we can explain a picture or a photo in words.
An interlaced window pane is one in which small pieces of glass, often differently coloured, are held together by an interwoven metal or wooden design. Such window panes are often found in churches. There was a great revival of interlaced window panes for residential decorations during the Art Nouveau and Art Deco periods.
I wish to say to Gordon that in European countries, including Britain, awareness of architectural details is something that is valued among all classes of the population. Schools teach it. It is not something that is the exclusive preserve of aesthetes or art students. A common labourer could be very interested in and knowledgeable interlaced window panes, just as a bus-driver could be a Shakespeare enthusiast.
This growing awareness of life being more than making a living and education being more than vocational training, and that culture and beauty are not the exclusive preserve of an elite, is of particular importance to our Chinese members as they live in a country in transformation.
One wishes to encourage, rather than discourage, curiosity and knowledge cultivation.