Kulu is near the north coast of Hokkaido, on the shore of a freshwater lake where rivers converge from the inland hills and commingle their waters before draining to the Sea of Okhotsk. The hills rise sharply from one end of that lake, looming over a cold silver creek that rushes down out of forest inhabited only by apes and demons. There are small islands in that part of the lake. If you dig down into the islands, or the hills, you will find veins of copper ore, and sometimes you will find zinc and lead and even silver. That is what the men of Kulu have done for many generations. Their monument is a maze of tunnels that snake through the hills, not following straight lines but tracking the richest veins.