There was a two-part series on TV the other week or so and focussed on the Fastnet lighthouse. What intrigued me was the use of dovetail joints in the granite stones that gave it its amazing strength and flexibility. Digging a little on the internet I found this scientific treatise.
https://www.sciencedirect.com/science/a ... 3918305118
I confess that 99% went straight over my head but it may interest some of you.