Hexfoil Marks on Old Books

Did the British Roman builders use the symbol because the local tribes found it superstitiously useful or did the British Roman builders use it for some other reason (guild mark, perhaps? The fact that it is an early Euclid math problem suggests it's interest to early architects) and the local tribes picked it up as a superstitious symbol?

Presumably these are hypotheses you could start to test if you collect enough evidence, which this article is part of chain of people searching for more evidence/patterns. It seems likely we may never know the full story, but an interesting thing to wonder about.

The site doesn't seem to be down, and it's a university blog that can probably handle heavy traffic. On the other side, directing a lot of traffic to the Internet Archive to use it as a caching proxy is going to be burdensome.