Concrete Wabi Sabi: Mountainsides
Any look at the aesthetics, or economics, of concrete in Japan would have to look at concreted mountainsides.
There is no doubting that Japanese mountainsides are, by and large, steep. That comes partially from Japan's "newness" geologically speaking, and that steepness causes problems that can be remedies by concrete.
But whether the truly staggering amounts of concreted mountainsides in Japan are truly necessary.... thats another thing.
Like many of the roads, bridges, tunnels, and tetrapods, their function is more to provide profits for concrete and construction companies. And jobs of course.