I've seen a few futuristic bicycle designs, but this one actually makes a serious and convincing attempt at addressing a basic problem:
http://www.tuvie.com/flexi-bike-with-rotating-frame-allows-you-to-change-your-riding-posture/
http://www.tuvie.com/flexi-bike-with-rotating-frame-allows-you-to-change-your-riding-posture
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