When we walk around in a fine day anywhere covered with much snow

When we walk around in a brilliant fine day anywhere covered with much snow, try to keep closing one side of your eyes. After a few minutes, open it and close the other side. You can find the the view with one side quite different from the others. Sun light reflected by covered snow is so strong that our consciousness of color can be unstable then. So, we can ask ourselves again "what is real color in photography?"