Grounding with a Earth box?

@ozzy 
Thanks for that comprehensive answer. Very generous of you to expose the secret sauce that's inside the boxes.
Interesting that the YouTube guy used your design, including the cigar box.

This has been very interesting. So the wood boxes full of crystals and other minerals provide a ground. If you could help me understand it better I know that ground is usually referred to as negative in a circuit but as a zero-volt reference point potential for a real ground. So how scientifically is this box of elements act as a ground? Why these minerals and not just a box of dirt? Do they provide a positive or negative reference?

https://youtu.be/zgqYdq0VgKg

Love Paul’s take on this subject at PS Audio.