A totem-like pattern is photographed on the icy surface of Qinghai Lake, the largest lake in China, April 12, 2019. The explanation for how the pattern, which is estimated to measure over a hundred square meters, came into being remains unknown. (Photos: Chinanews.com)

A totem-like pattern is photographed on the icy surface of Qinghai Lake, the largest lake in China, April 12, 2019. The explanation for how the pattern, which is estimated to measure over a hundred square meters, came into being remains unknown.