As an American, I'm certainly standing in a glass house when I point out Japanese exceptionalism, but one of the more charming aspects of it is how Japan embraces the changing of the seasons. People here, at least more than I remember from my childhood, make an effort to get outside and enjoy the signs of the changing seasons. Parks and urban greenery all seem designed around this idea, the idea of highlighting the greatest parts of the changing seasons.
The flag of Tokyo depicts the gingko leaf, and the gingko trees are never more noticeable in Tokyo than in the fall. It's great to watch people get out and enjoy them in some of Tokyo's beautiful parks.