There are many illusion forms that snow can take. Calvin is a master of the snow illusion as demonstrated below in Calvin's "Snowman House of Horror" and his "Swimmer and the Snow Sharks".
"Snowman House of Horror"
"Swimmer and the Snow Sharks"
Of course these illusions can be created in real snow also. Below they have had to rope off an area to keep people away from the rare snow lizard.
Of course you have to watch out for those giant snow big wheels. This one might have hurt someone. They were lucky this time but really parents have to watch their kids closer.
The real illusion of snow can be seen clearly in this snow scene. Not the fact that Bambi's father's spirit can be found watching over him, but the blanket of white snow that covers everything.
Snow itself is the true illusion. We walk in it, play in it and shovel it off of our driveways. The whole time we are under the spell of the illusion of snow. What do we see? White, piles and piles of white fluffy snow. The truth is snow is not white, it is composed of billions of snow flakes each one a unique work of art. You can see how these snowflake photographs were taken by going to this site.