Viking rituals

I'm interested in a phenomenon I learned about recently.

Medium and large branches, as well as small trunks, are arranged in a circular like fashion around a tree or small group of trees sorrounding an outcrop of rocks. A string of some sort having belonged to a personas is tied around one of the branches.

What do you think about this?

Little other thought than that I want to do it.
Few things feel cleaner than working with such materials, and this sounds potent.

Unfortunately there are no rocks to speak of here, in this land below sea level -
and hardly any space to do such things in private.

What if any is the special purpose to this ritual?

Unclear.

We'll have to find out in practice.

Actually, it is some fuckfaces crowding on my shit. I am in the process of dismantling it.

I know enough about witchcraft to know that if a personal effect is involved, it is usually some kind of curse anyway. Plus the dudes I noticed working on it where skinny jean wearing hipster looking motherfuckers.

where is this?

A wood atop a hill.