We made Ice Circle at the same location as the Leaf Circle at Diamond Lake in Wanaka where we live in New Zealand. The freezing midwinter conditions produced solid ice on the lake and we were able to cut the ring with climbing ice axes and a small saw. Extricating it and standing it up in the middle of the lake proved more difficult and we broke the first one while we were being filmed by a documentary crew.
Next day we returned and were successful! Evening light complemented the sculpture to make the image.
Here are Philippa and I (wearing crampons) cutting the ice circle from the frozen lake.