This sent us by Eva. It’s pretty long, and I haven’t watched it all, but I sure would if I lived where there was stone. Looks like a very thorough explanation of the principles of stone walls with and without mortar. A great explanation of why stone wall joints should not be lined up under one another.
I loved this part: “Every stone in the world has an ambition…” — pause, twinkle in his eye –“that ambition is to sink to the center of the earth as soon as possible…”