Grass today looks the same as grass 60 years ago. Blue sky today looks the same as blue sky 60 years ago. Human faces today look the same as human faces 60 years ago (save for hair and moustache styles). Even baseball uniforms today look very similar to baseball uniforms 60 years ago. These elements that you often see on a baseball card don't change much over time. But billboards do. Since advertising is constantly evolving to develop new ways of grabbing our attention billboards likewise constantly evolve and don't look the same from one decade to the next.
This is especially the case in Japan. This is not a land of peaceful Zen gardens and picturesque Shinto shrines. It is a land of billboards. They are one thing that really distinguishes Japanese cities from those in most other countries. Its standard practice in central urban areas for commercial buildings with good lines of sight to have giant structures on top of them which are sold for advertising. This is what the Nakasu area in Fukuoka, just up the road from where I used to live, looks like for example:
This is what it looks like after dark:
There is an American writer named Alex Kerr who wrote a couple of famous books about Japan back in the 90s. Mainly these books lament the loss of Japan's physical and aesthetic cultural heritage - you don't see much traditional architecture in Japan which is a real shame. I agree with him on a lot of points, but he also devotes some time to slamming the dominance of billboards in the urban environment, which he finds tacky. This is where our opinions diverge, I love the billboards. Look at the above photos and imagine how dreary and grey that location would look without all the vibrant color provided by the billboards, both during the day and at night. They are the only thing that give these cityscapes some life.