Perhaps the answer is A) fragility of life. Because butterflies are so tender and fragile, they might represent life itself, and how fragile it can be, and how quickly it can disappear in a second.
The Goths were a germanic tribe that was strong between the 12 and 16th centuries and they had a characteristic style of architecture including pointed arches, flying buttresses, tall windows etc and I believe that this style of architecture was common at the time in the elaborate Chrisitian churches of Europe.
