I've always been a huge fan of innovation in all its forms and the Japanese do things on such a grand scale and that's especially true of infrastructure projects. This most recent development is a direct result of solutions having to be found after Fukushima.
However there are other stunning examples of these projects that simply wouldn't be undertaken in other developed democracies. For example if you look at the sheer scale of the storm drain system that they have created in Tokyo. Stunning and truly beautiful.