A snow covered rotating planar disc, up to 300 metres in diameter, is inclined at around 25 degreees and made up of 5 or 6 concentric rings...Each of these rings is able to rotate independently in either direction around a static centre island at mean tangential speeds of up to 15 metres/per second."
Infinite downhill!
Click "The Concept" to see a video of the idea.
Link: SnowDome by SnowVolution
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