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If I had the chance to build whatever I wanted out of snow without getting cold I would more than likely build a perfect scale model of Hogwarts. It would take me forever to build but if I have unlimited snow then I better have unlimited time to do this. I would make it exact down the every little Crack on the walls. Heck, I would even build snow students in their respected houses. And if this snow model of Hogwarts was anything like the real thing the snow would be enchanted so that the snow students would come to life and be able to walk around and do their thing. The staircases would move along with the portraits.