I have memories of grindstones forget in fields from I was a child. It's giving a monolithic singularity to the countryside at the boundary between the humankind's ancient times and the gifts from mother earth.
Here, it a symbolic grindstone made from plastic. The true nature of this material is base on life cycles. The fossil energy and matter are coming from at least 3,5 billion years of life. My pieces of non-disposable plastics are here thanking to this life, all its monomers (plastic building block) come from different living beings.
Here, around 1 000 000 000 000 000 000 000 000 dead creatures give a single molecule for this piece of plastic... Life says thank you to mother earth.