French studio Martin Duplantier Architectes has proposed a plan that would install a series of bridges at China's Zhangjiajie National Forest Park - the site of the world's longest and highest glass bridge. The 5 million euro plan would include the construction of reflective steel structures located on top of the cliffs. "They are the opportunity, each in its own respect, to create a physical relationship with this rock face," said the studio. "The illusion of a mirror for the one, the fear of the void for the next, and lastly the setting in abyss for the final. The concept developed is that of illusionist development. Stealthy. Geometric. Contrasting with a complex landscape, the footbridges are of pure geometric shapes, which seem to have been placed delicately on the carved relief of the site." Take a look at the renderings below and click here for more architecture news.