Paper, walls, wood... The beautiful patterns of these places are believed to have been eccentric. But have you seen the beautiful pattern on the manhole cover?
The tradition of [using beautiful patterns on the manhole cover" began in the 1880s and was initiated by a Japanese named Yasutake Kameda. He was an architect at the National Architecture Office of Japan at the time. At that time, Japan's urban sewer system was similar to the current situation in China, costly, but inconspicuous. In order to make this huge government project attract more people's attention and popularity, Yasutake Kameda thought of "making the surface of the manhole cover more visual." The idea of becoming more eye-catching. Therefore, he encouraged cities, towns and villages to develop their own manhole cover designs with local characteristics. Gradually, individual manhole covers became popular throughout Japan. The manhole cover has become a city business card in Japan. It began with solving practical details, and became an art because of exquisite workmanship. Finally, it became popular and developed into a special culture. 
Almost every city in Japan can see colorful sewer manholes with animals, landscapes, historical stories or urban features, and a sense of design. Japan has more than 6,000 types of manhole covers and even built several manhole cover museums. A semi-official "well cover association" has also been established, consisting of 32 companies dedicated to the protection and study of manhole covers throughout Japan. According to the Well Cover Association, these manhole covers were designed by engineers in major cities such as Tokyo in the late 1950s, initially for non-slip. In the rainy season, accidents such as motorcycles and bicycles slipping on the manhole cover have occurred frequently. The engineer improved the surface of the manhole cover by adding some embossed pattern design, which is not only non-slip and beautiful. 
Editor: (Hardware Business Network Information Center)https://www.gdxxgm.com/
