Some people have seen them, some have not. Throughout the country of Japan, the covers that enter into the underground are not simply plates of iron: they bring a happy and refreshing visual display as one walks and goes about their day.[see_also]
Cities that have grown dark, grey and gloomy could certainly gain a lot of value by utilizing this type of cover in their own environments. If you know of other countries that have similar public art as such, we’d love to hear about it on our facebook page! You can find more examples of decorative manhole covers here.