I've been exploring Gurafiku, an online archive of Japanese graphic design. The site allows you to view work split up by decade and there are a lot of fantastic posters, book covers, and more collected here. Take a moment to look around. Here are a few of my favorites:
Ikko Tanaka, 1977
Yusaku Kamekura, 1968
Shigeo Fukuda, 1974
Kisho Kurokawa, 1970
1980
