Snowtunnels

Most people need to have snow to do their winter sport of choice.  With the Snowtunnel, you can have winter fun year-round, well, that is if you live in or visit Dubai's lavish indoor ski slopes in the middle of the desert. The Snowtunnel is a fairly simple device mechanically - a corrugated steel drum that has refrigerant piped through it to cool the metal. When water is sprayed on the drum's interior, it quickly freezes. Then, a rider hops inside on a snowboard and sets the drum rotating at a speed they're comfortable with, catching an edge on the iced-over metal and riding it like a cross between a snowboarder and a tube-riding surfer.