It is a piece in Hokkaido located in the north of Japan. In winter in Hokkaido, there are places where the temperature can reach -30 degrees Celsius. The water in this pond, called the blue pond, is blue due to the waterfall water containing aluminum. When the waterfall mixes with the river water ,the invisible colloidal particles are generated, which scatter the sunlight evenly so we can see the pond blue. When the ice begins, the entire pond will turn white in a week. I trapped the most beautiful time of the blue water and the white ice.