It started with dolmans, often called burial or ceremonial chambers but were indeed sound/vibration/frequency/lay line related. The older rounded arches I think made this effect, the old ancient ones like a Doleman would have. The newer ones for some reason went to the pointed arches and I am just guessing but think it did something with/to that system. The old cathedrals also were as deep into the earth as tall above ground and always built into bedrock like it's rooted there and always had a spring beneath at the center below. We hopefully get all this scattered information assembled into one reasonable and usable formula of true understanding someday soon.