On the right is a photo of a public square in the Gateway Mall in Salt Lake City. I particularly like it because it is convivial for adults who enjoy watching the dancing waters all day long. It is also appealing to kids who run in and out of the spouts with abandon and glee.
I see no reason why much more public space in our cities can't be convivial for people of all ages, teen agers as well. Good policy is possible, but we seem to be subject to the whims of each new batch of urban planners who in turn are subject to the fads in their graduate schools. I know because I have help start one urban planning fad, a questionable one.
Years later I was watching an ancient temple being remodeled in Tokyo. The temple was roughly 1,000 years old. On the inner side of the roof tiles were painted names of donors. The idea probably did originate in Japan, it most likely came to Japan from China.