Finally I called out to Mom and said, "Hey, Mom, look."
She came in and sat down.
"What colour is the snow?"
Laughing, I said, "No, Mom, it's blue. The snow is blue!"
She looked at it again and said, "No, it's white."
"Mom, just look at it. It's blue."
She looked again, and then at me with exasperation. "Don 't be silly. It's white."
Now I was getting exasperated with her. "Mom, can't you see that? That's blue snow!"
She got up and went in the other room.