The Greeks and Romans, at least from the Hellenistic period onward, used Neolithic stone axeheads to protect buildings from lightning. They thought that the stone hand axes were formed when lightning struck a rock, so tucking one in the rafters of your abode could protect it?
This is neat... but... some of those Greeks must have thought "a person made this thing" right?
What do you think?
@futurebird@sauropods.win
The logic was that via sympathetic magic an item or thing would pass on its special ability.
The Romans for example used bull’s blood in cement mixes believing this would add strength.
At the time the Greeks were looking at flint arrowheads, Brithonics were looking at barrows and megalithic structures and concluding the people who lived underground in the barrows had strong magic powers. Most faerie lore comes from this.