Now this is a fun way to cross a river! The conceptual Bouncy Bridge is the brainchild of the architect firm AZC. It's definitely the most in-seine-ly fun way to cross the Seine:
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An inflatable bridge equipped with giant trampolines, dedicated to the joyful release from gravity as one bounces above the river. Installed near the Bir-Hakeim Bridge, it is formed of inflatable modules, like giant life-preservers, 30 meters in diameter. In the central part of each ring, a trampoline mesh is stretched. The floating buoys, fabricated in PVC membrane, are attached together by cord to form a stable and self-supporting ensemble. Each module under tension - filled with 3700 cubic meters of air - develops in space with an arch-like form.