I once produced a small shell midden in my kitchen. Just now I made a small clearance cairn in the garden. My wife has ordered a peony bush from Gansu in China via a plant dealer in Turku, Finland, and I picked it up at a trucking firm the other day. Now it fell upon me to dig the hole and plant the thing. While digging I set aside all the stones I came upon, as lo-tech farmers have done for millennia, only at a smaller scale. And thus my little cairn.