It doesn't take a genius to realize that public spaces in Japan are filled with numerous audible and visual reminders about the importance of maintaining personal decorum.

Over the past year, some of the catchiest have been the "manner posters," by graphic artist Bunpei Yorifuji, that appear in the 168 stations and the carriages that serve the nine lines of the Tokyo Metro subway system.

Since April of last year, the 35-year-old designer has produced a simple yellow-and-black image each month urging subway travelers to refrain from such generally discomfiting activities as applying makeup, falling down drunk, talking on mobile phones, occupying priority seats for the elderly, infirm or pregnant women or rushing to board as the doors are closing.