As an actor, what's interesting is what's hidden away beneath the surface. You want to be like a duck on a pond - very calm on the surface but paddling away like crazy underneath. ↗
Anyway, so what he did was, he spread sheets for 100 yards and underneath them he'd put things so there were bumps and different levels and on top he'd put little bushes and if you didn't look to close, it looked like snow! ↗