Ralph Waldo Emerson wrote: "The sky is the daily bread of the eyes."
If so, then urban man is severely ocularly undernourished. Once broad and punctuated by the occasional construction, the sky has in our lifetime been all but overtaken by buildings -- and nowhere moreso than in Tokyo.
In other cities -- and you can try this -- you rarely have to raise your eyes more that 30 degrees from the horizon to get a glimpse of blue. In Tokyo, the combination of narrow streets and in-your-face architectural density puts that blue up at a neck-wrenching 75 degrees or more.