floating staircase

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Natural Building using Gravity and Stone

... This is 500 tons of Colorado sandstone, some gravity and Thea Alvin floating 12 feet (4m) down at the bottom. It's a spiral staircase cistern designed ......

http://naturalhomes.org/timeline/drystonecistern.htm Wed, 24 Aug 2016, 15:18:24 UTC

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