“Certainly that day we realised that the Logan stones were far more than remnants from a superstitious age that worshipped rocks. They struck us as huge scientific instruments, carefully & deliberately placed at certain points in the Earth’s energy system with the specific intention of interacting with it.” The Giant’s Rock at Zennor north Cornwall, UK made of Cornish granite, 95% quartz crystal, bears down on a tiny area of stone, creating a massive piezoelectric effect in the supporting stone. Rocking the stone, as you can do when standing on it, causes rhythmic ripples through the Earth’s magnetic fields. In Cornish folklore the rock is connected with both Giants and witches.