The Rolling bench

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Why do public benches never seem to dry? A simple solution to an age old problem, The Rolling Bench ensures you’ll have a dry pad to sit on no matter the conditions.
Designed by Korean firm Sungwoo Park and friends, the bench is built on a rotating axle. Just turn the hand crank to unveil the dry side of the seat so you can take a load off without getting a wet behind.

Via Yanko design.

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Source: http://www.yankodesign.com/2008/01/31/the-dry-side/