© zyxzevn

There is a paper from the maker of the coral castle about Magentic Current

Magnetic-Current_Edward-Leedskalnin

It woud be interesting to understand a bit more about the principle behind it and
replicate what he did. 

A related phenomenon is the Hutchison effect.
http://www.thehutchisoneffect.com/
It shows some interesting experiments. It is related to Tesla.
There is not much theory behind it.