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Conclusion

In Japan, a number of manhole covers have been featuring artistic designs since the 1980s. There is enough interest in them to allow merchandise and conventions, with an estimated 12,000 designs spread across Japan by 2019.^[32] These could be found in nearly all cities and towns in the country.^[33] Popular media franchises, such as Gundam and Pokémon, have also been featured in the covers with hundreds of Pokémon-themed manhole covers across Japan.^[34]

In addition, circular manhole covers also offers the advantage of resisting on Earth's compression around it which plainly shows both the technical and practical reason why manhole covers should be design round.

First and foremost, tree grate frames protect the root systems of trees from physical damage caused by pedestrians, vehicles, and other urban activities. Tree roots spread outward and can extend well beyond the tree canopy. When these roots are unprotected, they are susceptible to compaction, which can suffocate them and impede their growth. Moreover, physical damage caused by foot traffic can lead to injuries that may compromise the tree's health. The installation of tree grate frames mitigates these risks while allowing pedestrians to navigate through urban spaces.